White Paper by pengxuezhi


									                         Agentur, Friesenplatz 25, 50672 Cologne, Germany, Tel. +49.221.951515-0, Fax -66
koeln@pixelpark.com, http://www.pixelpark.com

                                                                           White Paper

                          Serious Games – The State of the Game
                          The relationship between virtual worlds and Web 3D

                          29th May 2008

                          Dirk Krause

Pixelpark Agentur, 2008
                          White Paper


                          1     Preface                                                                                 4

                          2     The State of the Game                                                                   5
                              2.1.      Term acceptance                                                                 6
                              2.2.      The ‘promise’ of serious games – why are serious games important?               7
                              2.3.      Just a game, or is it?                                                          8
                              2.4.      The computer game debate                                                        9
                              2.5.      Dissociation from AAA games (full-price games)                                  9
                              2.6.      Dissociation from casual games                                                  9
                              2.7.      The mechanics of serious games                                              10
                                2.7.1      Computer game genres                                                     10
                                2.7.2      Classifying serious game genres                                          11
                                2.7.3      Didactic concepts                                                        13
                                2.7.4      Business models and measurability                                        13
                              2.8.      Examples                                                                    15

                          3     Web 3D and Virtual Worlds                                                           18
                              3.1.      Web 3D                                                                      18
                              3.2.      Virtual worlds                                                              20
                                3.2.1      Creating the immersion effect                                            20
                                3.2.2      Classification by display and interaction type                           21
                              1D                                                                  21
                              2D, 2.5D                                                            22
                              3D                                                                  22
                              3.3.      First person, third person – game figures and avatars                       23
                              3.4.      Virtual multi-player worlds                                                 25
                                3.4.1      Second Life                                                              26
                                3.4.2      World of Warcraft                                                        27
                                3.4.3      Comparability of SL and WoW                                              27
                              3.5.      Revisited: when is a game a ‘game’ and when is it ‘serious?’                28
                              3.6.      Special case: mirror worlds                                                 30
                              3.7.      Special case: virtual worlds for learning                                   30

                          4     End Devices for Using Serious Games                                                 31
                              4.1.      PCs                                                                         31
                              4.2.      Smartphones and Handhelds                                                   32
                              4.3.      Using games consoles for serious games                                      33
                              4.4.      Controllers                                                                 34

                          5     Technical Realisation of Serious Games                                              35

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                              5.1.      1D text adventures, interactive fiction, MUDs/MOOs           35
                              5.2.      DHTML                                                        35
                              5.3.      2D, 2.5D                                                     35
                              5.4.      3D and 3D game engines                                       36
                                5.4.1     Papervision3D                                              36
                                5.4.2     Shockwave 3D                                               36
                                5.4.3     XNA                                                        36
                                5.4.4     Torque                                                     37
                                5.4.5     Unity3D                                                    38

                          6     Conclusion                                                           38

                          7     Bibliography                                                         39

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                          1       Preface
                          The rapid pace at which innovative technologies (particularly on the Internet and in 3D
                          environments) are developed often makes it difficult to classify associated topics for
                          service providers, customers and end users.

                          This purpose of this white paper is to highlight how the topics of Web 3D and virtual
                          worlds are set to play a key role for serious games, thereby achieving added value. It
                          must also be pointed out that serious games are relevant for each economic sector that
                          wishes (or requires) to reach its target group on the Internet or in application development
                          by means other than the classical channels in use at present.

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                          2        The State of the Game
                          The term ‘serious games’ defines applications that impart serious content by using the
                          entertainment elements and established mechanisms contained in computer games.

                          As such, ‘serious games’ is a blanket term that includes application types such as
                          edutainment, simulations or advergames, to mention but a few (see section 2.7.2 for a

                               -    Serious …
                                    The word ‘serious’ refers to the nature of the focal point of an application’s
                                    content or the purpose of the application. Of course, this does not mean that
                                    commercial games cannot have a serious purpose, such as creating sales. In this
                                    context, however, the word is used in reference to the effect that the game has
                                    on the end user. It must be assumed here, that the user is aware that they are in
                                    a serious-gaming context and this has an impact on any expectations they may
                                    have of the application.

                               -    … Games
                                    Here, the user is in a user scenario that they perceive as game-playing. During
                                    the game (or the activities perceived by the user as game-playing), the user
                                    accesses the supplier content in the application in an intensive, yet entertaining
                                    manner. The advantage of this user scenario is that it opens up a variety of
                                    access options to users that are unavailable in other media such as books or

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                          2.1. Term acceptance
                          As a service provider, Pixelpark designs applications for customers and their end
                          customers. With this in mind, it is not uncommon to find that there is a need for
                          moderation by different user groups, such as the dual customer/end customer target
                          group, when addressing target groups (a consulting service we are frequently called upon
                          to provide).

                          Addressing target groups is not problematic if the terminology has already become part of
                          the general (professional) vocabulary of the service providers, customers and end
                          customers. An example of this is the field of content management systems. This subject
                          area has been pegged out for years by parties involved professionally with the Internet,
                          which is why the abbreviation ‘CMS’ rarely requires a glossary entry.

                          This is not the case for terms that have multiple meanings (which is often the case where
                          media applications are concerned ) or that contain words that already have different
                          definitions elsewhere.

                          The term ‘serious games’ is currently only known by organisations that are already
                          involved with topics associated with it. Whether customers or end users encountering this
                          term for the first time will understand what is meant by it may depend on the context of
                          the situation it is used in. Experience shows that both components of the term cause
                          confusion and even annoyance. The reason for this is that users may have a problem
                          with the entertainment factor or perhaps the lack thereof.

                          This term will continue to require an explanation until it becomes established or is
                          replaced by a newer, more precise variant in future. Until then, it will be defined as above.

                              Example: The term ‘portal’ can be used to describe a news portal in an Internet context, but it can also
                          describe the ‘portal technology’ with Java Portlet Specification JSR 168. Finally, a ‘portal’ can also be
                          implemented with ‘portal technology,’ although each term has a different context.

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                          2.2. The ‘promise’ of serious games – why are serious games important?
                          The idea behind serious games lies in attempting, at least in part, to deliver the promise
                          made a few years ago by society’s digital media. That is, presenting content in the new
                          media on time, with real added value and utilising the full potential of the digital media.

                          The digital information revolution with all
                          its highs and lows has, to a certain extent,
                          steamrollered society and its desire for
                          innovation. As a result, we do not make
                          full use in the media of what might
                          theoretically be possible regarding
                          technology and information. Nevertheless,
                          there is an increasing awareness of the
                          need to use the challenges and market
                          opportunities brought about by the digital
                          revolution. However, the media
                          competence aspect (the area with the
                                                                                    The Auto-Tutor, exhibited at the World’s Fair
                          slowest growth, despite urgently requiring                in 1964 (3)
                          growth) is still receiving far too little

                          The key driving forces behind serious games and other subareas of the multimedia sector
                          are as follows:

                                 -    The high computing power of current, standard PCs

                                 -    The increasing availability of online flat rates from network operators

                                 -    3D acceleration hardware as standard

                          Section 3.4 provides further details about the availability of these key factors and the
                          availability of other end devices.

                              This has led to the current revival of technology concepts that were propagated at the beginning of the decade
                          and which are now being reissued under different names, or even the same names. In addition, user behaviour
                          and industry expectations are often diametrically opposed (the high-priced success of UMTS, the unexpected
                          success of YouTube, the questionable success of DVB-H).

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                          2.3. Just a game, or is it?
                          The term ‘game’ is used in a broader sense in this document. In this context, it stands for
                          an application that establishes a game-like situation for users.

                          In terms of classifying a game, this definition of the term does not necessarily require
                          formalised criteria for success such as praising winners, totalling points or reaching
                          certain areas in a level.

                          An appropriate definition is provided in Wikipedia. Although strong, scientific claims would
                          not satisfy Wikipedia’s reference criteria, this definition serves as adequate confirmation
                          of the term’s usage in this case.

                          Using a game’s contextual situation to define it is logical in the serious gaming
                          environment because

                               a) It is necessary to avoid contending situations under certain circumstances,

                               b) It is not necessary to establish measurable parameters, thereby avoiding any
                                    implicit ranking.

                          For example, in ‘DON CATO – die
                          Rückkehr des Luchses’ or ‘Return of the
                          Lynx’ (see 2.8), there is no end to the
                          game in the classical sense. The means
                          that users (generally children) continue to
                          replay the game, thereby repeatedly
                          processing the content presented to them.
                          As such, messages like ‘You win!’ have
                          been deliberately omitted since they
                          would detract from the value of the project   Screenshot from ‘DON CATO – Die Rückkehr
                                                                        des Luchses’ (Return of the Lynx)
                          as an aid to learning.

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                          2.4. The computer game debate
                          Naturally, the ongoing debate around the positive and negative impact of computer
                          games also influences the development of serious games. Although it is not within the
                          scope of this document to discuss the merits of this debate, the computer game genre is
                          often held in disregard (depending on which groups are surveyed), particularly in
                          Germany. As we have already seen in section 2.1, even mentioning the word ‘game’
                          (regardless of whether it is ‘serious’ or not) can be a stumbling block in some instances.
                          Customer approach is a decisive factor in this. Where doubt exists, it is better to establish
                          a subordinate term such as ‘eLearning’ or ‘3D World’ until partners reach the same
                          terminology level.

                          2.5. Dissociation from AAA games (full-price games)
                          Developer studios that produce AAA games (‘Triple A Games’ or full-price games) have
                          budgets of millions available to them. They are written for the current or next generation
                          of computers or consoles and represent the benchmark for current technology. They can
                          be viewed as a driving force behind the industry. With the exception of ‘America’s Army’
                          (see section 2.8), no serious game lives up to this standard.

                          However, serious games do not actually have to live up to this standard if we take into
                          account the fact that they are primarily about reaching target groups rather than next
                          generation features. Of course, as far as the genre is concerned, these target groups do
                          not own the latest, fastest generation of computers. It is for this reason that serious
                          games are somewhat (and, in some cases, totally) overshadowed by their big brothers.

                          2.6. Dissociation from casual games
                          Casual games can be defined as games that can be played from time to time.

                          The following are key factors here:

                               -    Game principle must be easy to grasp

                               -    Low turnaround times

                               -    Low hardware requirements

                          Because the above characteristics can also be (but are not necessarily) present in
                          serious games, serious games are often generally looked upon as casual games. This is
                          not necessarily the case when roles are reversed.

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                          2.7. The mechanics of serious games
                          Whether or not an application is perceived as a game depends heavily on the type of
                          format it has (see also the definition of a game in section 2.3). Careful thought is required
                          when determining which format type is right for the target case. The final choice should
                          be based on didactic, technological, business and media considerations.

                          At the opposite end of the scale to special applications that are created as serious
                          games, we have ‘serious’ applications. However, even these applications can be used for
                          game content. Applications with a scripting language lend themselves particularly well to
                          this, e.g. Microsoft Excel .

                          2.7.1 Computer game genres
                          Computer games have been around for a few
                          decades now. Over the course of time, the
                          various game subcategories have become
                          established as genres. Studying these genres
                          can even provide valuable information for the
                          topic of serious games.

                          The following classification is in sync with the                  1: PacMan in Excel
                          arguments of Prof. Maic Masuch (1) and
                          excerpts are used here for reference purposes. Each area of user demand is shown,
                          producing a pattern which could possibly be used to determine which genres are
                          favoured for conveying certain types of content.

                                 -    Action: requires fast coordination and skill. Typical of the genre are first or third
                                      person shooters (see section 3.3)

                                 -    Strategy: requires strategic thought, e.g. in a military conflict simulation

                                 -    Organisation and Management: requires planning skill in a simulation of business
                                      and social structures

                                 -    Vehicle Simulation: requires a high degree of understanding for the technical
                                      simulation of a real or fictional vehicle type

                                 -    Role-playing: requires skill in order to improve various abilities

                              To a certain extent, this is the inversion of the serious gaming idea in that non-game engine technologies are
                          used to create entertainment applications.

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                               -    Sport: requires an understanding of actions and tactics that are specific to sport

                               -    Adventure: requires logical thought and combined ability

                               -    Classics: chess, tennis etc. – there is no general pattern here.

                          See below (1) for a differentiated description.

                          This classification can be used as yardstick in serious game development for working out
                          relevant genres for the planned application.

                          2.7.2         Classifying serious game genres
                          It is difficult to distinguish the various genres of serious game applications from each
                          other. The reason for this is that the classifications are as debatable as the term ‘serious
                          games’ and it can be difficult to determine clear differences.

                          Almost all of the terms used below consist of word combinations and are intended to be
                          self-explanatory in addition to clarifying the focus of particular applications. Unfortunately,
                          these word combinations have a lot of potential for overlap and clarity is not assured.

                          It is therefore impossible to distinguish these terms fully. However, they are valuable in
                          that they do highlight the focus of applications.

                          The following is a selection of the most common terms in use.

                               -    Edutainment
                                    Combination of education and entertainment. An application that imparts learning
                                    material during a ‘normal’ game comes under the heading ‘Edutainment.’

                               -    Game Based Learning (GBL)
                                    The emphasis here is on the structured measurement of learning progress.
                                    Classical didactic methods also tend to be used.

                               -    Simulations
                                    Generally speaking, simulations have very few game characteristics or none at
                                    all. They often focus on conveying highly complex, technical data.

                               -    Advergames
                                    Combination of advertisement and games. As a classical application area for

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                                    serious games, this type of game is usually intended to communicate positive
                                    statements about a specific product to a person.

                               -    Exergames
                                    The terms ‘exercise’ and ‘games’ have been combined here to describe computer
                                    games for which users have to perform movements in front of the computer to
                                    complete objectives. These movements are usually relayed to the computer
                                    through a special controller. The significant growth in this sector is primarily
                                    attributable to Nintendo’s Wii consoles whose new controllers have made
                                    computer games involving physical activity ‘cool.’ Although controllers such as
                                    these have actually been around for a long time, they were really only seen in the
                                    Asian sphere. The huge success of the Wii console has led to a real market
                                    boom in this sector.

                               -    Health Games
                                    This genre is aimed at improving general knowledge of illnesses. However, it also
                                    has a very practical use in that it can augment the treatment of patients. It has
                                    been proven that the way in which users proceed in the game directly improves
                                    their knowledge of illnesses. This fact together with an increased level of self-
                                    confidence can directly aid in tackling illness.

                               -    Innovation Games
                                    In this type of game, users that are part of the desired product target group are
                                    brought into a game context in which they ‘win’ improvements to the respective
                                    product. Possible target groups of this game type are:

                                        o   Internal users: the employees of a company are involved in the process
                                            of improvement whilst playing the game.

                                        o   Selected external users: a reference group from the desired target group
                                            is involved by playing the game.

                                        o   General external users: anyone can take part and they are involved by
                                            playing the game. This type of innovation game is an example for the
                                            development of the open innovation process.

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                          2.7.3 Didactic concepts
                          Because users are attracted to the genre of serious games, the definition of the didactic
                          concept depends on which genre is chosen. There is no direct reproduction of didactic
                          concepts in serious game concepts. Therefore, the challenge lies in harmonising the
                          contrasting game concept and didactic concept.

                          When selecting a conception team for a serious game, it is wise to pick people that are
                          fully qualified and who know game mechanics and their effect on users (2).

                          2.7.4 Business models and measurability
                          Serious games are often created as individual orders in project form by service providers
                          such as agencies.

                          It is often the case that the content to be conveyed (e.g. advertisements in the case of
                          advergames or charitable statements in the case of Food Force) is of such importance to
                          the client that the game itself is either provided free of charge for the end user or can be
                          obtained for a nominal fee.

                          As such, serious games have a viral nature which certainly makes sense in this context.
                          However, they can also leave project managers working for the client and the service
                          provider struggling to explain the cost-efficiency of the project. The measurability of the
                          levels of success achieved in reaching target groups is a core requirement for serious

                          As far as offline media (such as CD ROMs or DVDs) are concerned, only the number of
                          orders can be used to determine the actual degree of usefulness. For this reason, today’s
                          offline media also often contains feedback channels. One option here is providing a
                          postcard to be returned, though this is now an almost antiquated method. More current
                          options are an accompanying website for obtaining user opinions or a direct feedback
                          channel on the Internet, such as a high score mechanism.

                          An appropriate tracking program can be used to carry out a direct evaluation in online
                          applications in the browser or open an Internet connection. This makes it possible to track
                          user behaviour in a highly differentiated manner.

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                          Differentiated user behaviour can also be evaluated in script-capable virtual worlds. (see
                          section 3.4.1).

                              Allowing user programs to be executed.

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                          2.8. Examples
                          A few of the better-known examples of serious games are summarised in the following.
                          Some examples (such as America’s Army and September 12 ) have been and are still
                          the subject of political controversy. Others are classical examples of edutainment

                          Of course, the examples described here only represent a fraction of the serious games
                          available. Full reviews and some downloads are available on the Internet.

                                        INTEL SECURITY GAME – CRIME SCENE

                          Game type: adventure, Technology: Adobe Flash

                          The special feature of this game is that it
                          allows actual players to play in a
                          prerendered 3D environment created
                          using computer graphics. This results in a
                          high degree of identification with the
                          characters and avoids the detachment
                          often felt by users towards 3D characters
                          in other games.

                                        AMERICA ’S ARMY

                          Game type: action, Technology: Unreal 2 and 2.5 Engine

                          America’s Army is special in that the
                          Unreal game engine was used to produce
                          it. The primary reason for its inclusion
                          here is that it is the only serious game that
                          has attempted to keep up with AAA
                          products. The game has been the subject
                          of ethical debate because it is used as
                          part of the recruitment process for the US
                          Army’s infantry units.

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                                        FOOD FORCE

                          Game type: development, Technology: Adobe Director

                          As the official game of the United Nations,
                          Food Force underlines the UN’s positive
                          work. The player learns about some of the
                          difficulties involved in distributing foodstuffs
                          around the world. It is highly regarded
                          because of its subject matter and is often
                          highlighted as a prime example of a serious
                          game with a positive focus and a
                          humanitarian message. According to the
                          UN, 4 million users discovered this game in
                          2006 alone. This also makes it a good
                          example of a serious game with mass appeal. With these user numbers, Food Force is
                          able to keep up with AAA products.

                                        DON CATO – DIE RÜCKKEHR DES LUCHSES (RETURN OF THE LYNX)

                          Game type: adventure, Technology: Director

                          The German Federal Environment Ministry
                          released this game back in 2001. What is special
                          about it is that game-play is free flowing. The
                          flow of the game depends to a large extent on
                          the atmosphere propagated by the displayed
                          environment and the protagonists. It can be seen
                          as a traditional edutainment product both in this
                          sense and because of the fact that it was
                          distributed by a government ministry.

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                          Game type: action, Technology: proprietary development

                          This health game is special in that it has a
                          real, positive effect on its target group of
                          cancer patients (particularly children). In
                          the game, players actually ‘fight’ their own
                          illness. Tests have shown that this stiffens
                          patients’ resolve and strengthens them. At
                          the same time, they learn facts about their
                          illness and why certain medications and
                          treatments have to be used.

                                        SEPTEMBER 12TH

                          Game type: action, Technology: Adobe Flash

                          Despite being quite unsophisticated, this
                          serious game by Gonzalo Frasca has been
                          the subject of a great deal of controversy.
                          It explains in simple terms why the war on
                          terror is so difficult. Although players can
                          use weaponry to eliminate terrorists at
                          large, innocent bystanders are also
                          permanently in their sights. As a result,
                          innocents always end up being
                          unintentionally destroyed by the player.
                          The subsequent grief of the witnesses and their resulting hatred mean that the player
                                                                         creates more and more terrorists. These
                                                                         have to be eliminated again and the player
                                                                         is caught in a vicious circle.

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                          3         Web 3D and Virtual Worlds

                          3.1. Web 3D
                          Since the birth of the World Wide Web 15 years ago, people have been coming up with
                          ways of enhancing and improving it. One obvious option for enhancing it is to use virtual
                          objects and places to change, replace or enhance the document-oriented structure with
                          pages and sites.

                                                                       One possible way of achieving this would be
                                                                       to make the Web 3D-capable. Silicon
                                                                       Graphics (SGI) and other companies made
                                                                       suggestions to this end in 1995. Back then,
                                                                       SGI had hoped that they would be able to use
                                                                       the World Wide Web to access a wider
                                                                       market for their workstations with highly
                                                                       advanced 3D capabilities. The Inventor
                                                                       Format provided for this by SGI represents
                          the basis for the VRML format, thereby creating a kind of ‘3D HTML.’ In addition to
                          allowing 3D objects to be loaded and displayed on HTML pages, VRML allows links
                          within these objects. This means that entire sites can be created from VRML.

                          There were a few reasons for the limited success of this approach. On one hand, users
                          expected realistic interaction in a 3D
                          context, rather than just a display of
                          3D objects. In other words, they
                          expected what we now understand
                          by virtual worlds (see section 3.2).
                          VRML was incapable of living up to
                          these expectations since, for
                          example, even realising gravitation
                          represented too great a challenge.
                          On the other hand, the computing
                          and graphical quality of the standard
                          PCs available at the time was still relatively primitive. Furthermore, the cost of an SGI
                          workstation did not exactly make it suitable for the mass market. A third point was that

                              Not the only one (see section 3.2.1.)

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                          any VRML model that even came close to producing realistic effects was too large to
                          justify at the time in terms of the band widths and the associated waiting times and costs.

                          Now, in 2008, we can consign all of these points to history. We are now fully capable of
                          creating appealing Web 3D objects, in other words, displaying 3D objects in the www
                          context (the ‘how?’ is explained in section 3). We have now reached the stage for the
                          single player/user context that SGI wanted to be at all those years ago. However, this
                          development has progressed relatively slowly since today’s expectations are more
                          focused on entire virtual worlds rather than 3D displays on the Web. As explained in the
                          following (see sections 3.4.1 and 3.4.2), applications such as Second Life and World of
                          Warcraft have played a role in this.

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                          3.2. Virtual worlds

                          What is Web 3D lacking when compared to/as we cross over to virtual worlds?

                          The simplest way of giving users the subjective impression that they are in a virtual world
                          is to ‘transfer’ them to a virtual environment where they are able to move.

                          Additional parameters also have to be created if the application is to be of any use. The
                          following are the minimum requirements in a single player context:

                               -    The environments (e.g. levels)
                               -    The rules for interaction with the environment (e.g. gravitation, collision detection,
                               -    The rules for picking up and dropping objects (e.g. items)
                               -    The existence of NPCs (non player characters such as ‘bots’) and interaction with

                          The following parameters also apply in multi-player contexts:

                               -    Interaction with PCs (other users’ avatars)
                               -    Communication with PCs

                          The following must also be considered for ‘Massive multi-player’ contexts:
                               -    The persistence of the virtual world
                               -    The economy
                               -    The community

                          3.2.1 Creating the immersion effect
                          Three-dimensional displays are not strictly necessary to create the immersion effect, that
                          is, the subjective feeling of involvement in a virtual world. Users can only have a mental
                          perception of the world because it is virtual. As such, the degree of immersion, or level of
                          involvement in the events in the game, can be influenced using various stimuli. Aside
                          from visual impressions, these can include audio elements or game controllers.

                          Firstly, however, the various types of graphical output are classified in the following.

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                          3.2.2 Classification by display and interaction type

                          The oldest form of computer game is
                          text-based, meaning that it has no
                          graphics and only uses text to create a
                          game context. Ever since the oldest
                          example ‘Colossal Cave Adventure’
                          from 1976 and the subsequent text
                          adventures of the 80s (particularly those
                          by Infocom), ‘MUDs’ have continued to
                          enjoy popularity as typical massive multiplayer games of this genre. The latter are also
                          being used in Canada for eLearning purposes. Otherwise, single-player interactive
                          fictions (IF or text adventures) only have retro appeal.

                          In text adventures (aka IF or interactive
                          fiction) or in a multi-user domain (aka
                          MUD or dungeon), users interact by
                          entering text commands. In other words,
                          movements are made, for example, by
                          entering directional commands such as
                          ‘go north’ or even just ‘n.’ Thus,
                          movements are made without switching
                          between scenes. The user also triggers
                          actions with text commands. Both the
                          game and the player always have a status      2 Infocom Werbung from around 1983

                          that has been precisely defined.

                          A typical member of this genre is ‘British
                          Legends’ which was very popular at the time
                          of CompuServe and which can still be played
                          online to this day.

                          The classical MUDs sparked various
                          modifications, above all the MOO (MUD
                          object-oriented). Today, this category is often
                          still used for eLearning purposes and (if we look at it from the perspective of the
                          previously mentioned definitions) can be seen as part of serious games. MOOs enhance
                          MUDs in such a way that locations can be built within the game (user-created content).
                          MUDs/MOOs are less popular because their output is purely text-based.

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                          Remarkably, almost all 3D virtualisations have a console on which users can enter text to
                          chat or issue commands as a power user. Thus, a pattern emerges whereby users prefer
                          1D input as of a certain functional level because it is ‘easier and faster,’ even in
                          immersive 3D worlds. The existence of this pattern is confirmed by the increasing number
                          of services that function primarily via text input. One example here is ‘Twitter.’ This web
                          service allows users to send text messages to a group of people via a very simple
                          interface, thereby effectively functioning as a group text messaging service.

                 2D, 2.5D
                          2D and isometric variants (commonly
                          referred to as 2.5D since scenes are
                          displayed diagonally from above without
                          perspective distortion) are popular
                          display formats, particularly in Web
                          browser and flash environments. The
                          advantage here is that no 3D
                          acceleration is necessary on the client      3 Habbo Hotel

                          computer. In addition, the Flash Player
                          is now so widely distributed that it does not have to be installed. It provides a simple way
                          of ‘simulating’ the graphical immersion of a 3D context without any great hardware or
                          software limitations.

                          It is, however, essential that the player figure is always visible, even in this variant. The
                          user is therefore aware that they are controlling a player figure and that they themselves
                          are not involved in the game’s events. Any identification the user has with this figure is
                          therefore learned.

                          Movements are performed in two ways in games of this type. The first is point-and-click,
                          where the figure is made to move to a position when it is clicked on. The second is cursor
                          control which attempts to map the isometric display on the cursor cross.

                          3D game formats are some of the most immersive because both the first and third person
                          variants make the user feel as though they themselves are part of the events in the

                          The 3D format has shaped the genre of computer games.

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                          3.3. First person, third person – game figures and avatars
                          In order to create the display of an environment in a 3D game, a point of reference is
                          required from which the player perceives the environment. A field of vision is also
                          required through which the user sees the game world on the monitor. This field of vision
                          plays a crucial part in immersing the user in the virtual world.

                          Technically, a virtual camera is placed in the virtual environment and this determines
                          what is graphically displayed (generally speaking, the polygons of a 3D world are
                          rendered on a 2D screen). In current games, first and third person views are displayed
                          depending on the respective narrative point of view.

                          The basic premise for these game modes is that the player is controlling an object in the
                          game, that is, the game figure. Where this game figure represents the player’s virtual
                          ‘self,’ then it is referred to as an avatar. Whatever the player sees depends, therefore, on
                          the position of the virtual camera in relation to the game figure. How or whether this game
                          figure is perceived in relation to the environment depends again on the game mode that
                          is in use.

                          In first person mode, the arrow keys or WASD keys are used to steer a virtual camera
                          around a virtual environment. Depending on the game, the camera’s field of vision is
                          between 70 and 80 degrees which closely represents the normal human field of vision. Of
                          course, this display is a mere approximation of the actual vision involving head and eye
                          movement we use to guide us in the real world. A side effect of this approximation in the
                          game is that the game figure is either not displayed at all (one does not see oneself when
                          looking straight ahead either) or only a part of the body is visible (e.g. in an action game
                          this might be an arm and hand holding a weapon). Therefore, the representation of the
                          player or game figure is required for games that are strictly in the first person view
                          because they can never actually be viewed themselves.

                          The effect of this is that in the first person view, the player always feels as though they
                          are part of the events in the game. This is even the case if the player is aware that they
                          are possibly representing someone else .

                              This point features in the current political discussion around computer games. It is unclear as to whether
                          identification with the game figure is excessive in this mode. However, this discussion is not part of this paper
                          (see section 2.4).

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                          In third person mode, the virtual camera is positioned behind the game figure, which is
                          why the player only sees the figure’s back. The advantage of this is that the player can
                          always see ‘who they are.’ The disadvantage is that the figure obscures part of the
                          environment. In addition, camera positioning becomes difficult when the figure is standing
                          with its back to a wall. The current way of overcoming this is that the camera is
                          temporarily swivelled around the figure. The challenge here lies in avoiding obstacles that
                          might obscure the game figure from the user. In a third person view, the relationships
                          between the camera position, figure size and the environment that are perceived as
                          correct are not physically correct .

                          Thus, there is less identification with the game figure in a third person game than in first
                          person mode. For this reason, this type is more suitable for game scenarios that allow the
                          management of multiple avatars.

                          What must also be pointed out is the fact that players are always in first person mode in
                          1D contexts and always in third person mode in 2.5D contexts. Both are possible in a 3D
                          application. Scenarios exist in which users switch between both modes (e.g. for in-game
                          cut scenes, that is, film sequences realised within the game engine).

                              The size of the space has to have a scale factor of 2 in relation to the size of the game figure: see (3).

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                          3.4. Virtual multi-player worlds
                          We now come to the issue of how to make virtual worlds for multiple players. The key
                          areas in this are the protocol and architecture.

                          A characteristic of virtual 3D worlds is that they cannot run via standard web protocols
                          because the demands placed on protocols by virtual 3D worlds are very high. The main
                          problem is that the http protocol, which drives the WWW, is not suitable for real time
                          applications. As a consequence, the classical client/server technology of the Web cannot
                          be used for virtual 3D worlds. No standard for the server technology of a virtual 3D world
                          (in other words, server software and a corresponding protocol) exists yet. As far as clients
                          (for the application or the browser plug-in) are concerned, various manufacturers are
                          competing to win favour with users (see section 5). However, at least fully developed,
                          functioning solutions exist for this area. Companies attempting to establish virtual
                          MMOGs (Massive Multiplayer Online Games) on the market have to deal with both
                          aspects: the client server applications or browser plug-ins and server operations. This
                          means that operators of MMOGs either operate their own servers or have them run by
                          other parties. With this in mind, the more successful a virtual 3D world becomes, the
                          higher the running costs will be. Hence, operators have to construct their own scalable
                          infrastructure which leads to significant levels of expenditure.

                          Two important phenomena exist at present that cannot be ignored when looking at virtual
                          3D worlds. These are World of Warcraft and Second Life. Both continue to be the subject
                          of a great deal of controversy. However, even though these two phenomena were not the
                          first of their respective genres, they can now certainly be viewed as driving forces.

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                          3.4.1 Second Life
                          Second Life (SL) is produced by Lindenlabs
                          who themselves describe it as a virtual 3D
                          world. However, it can also be described as an
                          MMOSG (Massive Multiplayer Online Social
                          Game) . Although SL has existed since 2003, it
                          only began to receive widespread recognition
                          at the end of 2006.

                          “Second Life is a synthetic world that is                     4 Second Life in Windlight Viewer (12)
                          realistically displayed on PC screens. It can be
                          fully configured to suit the individual requirements of a project, brand or campaign. Users
                          experience this world in the ‘first person’ because they themselves are represented there
                          by a personified character or ‘avatar.’” (3)

                          The limits and potential of SL are explained in detail in (3).

                                                                                   What must also be considered here is the
                                                                                   ability of the SL platform to support ‘user-
                                                                                   generated content.’ This is an important
                                                                                   characteristic of SL since it enables users to
                                                                                   create their own 3D objects and scripts. As
                                                                                   such, SL makes it possible to create serious
                                                                                   games directly within it and use script to
                          store measurability. Perhaps this makes it easier to understand the hype surrounding SL.
                          The potential of the very far-reaching, ‘user-generated content’ means that SL occupies
                          an extraordinary position. At a glance, this is probably the closest one can get to a vision
                          of a next generation Internet, or Web 3D. Quite a lot of water has passed under the
                          bridge since Second Life made its first appearance and its relevance is now more
                          disputed than ever. What is true is that SL is currently seen as a role model for virtual
                          worlds. On one hand, this has the following positive side effects:

                                 -       Virtual worlds are viewed as relevant for social and economic issues.

                                 -       3D applications can be developed as independent programs in the Second Life
                                         client without the classical web browser context.

                              The aforementioned game definition applies here (2.3).

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                          On the other hand, the following negative aspects also become apparent:

                               -    There is no direct relationship with the ‘classical’ Internet due to the browser
                                    independence. Although this is currently being enhanced in Second Life by the
                                    operating company, the integration is not yet complete.

                               -    Second Life currently embodies a 3D virtualisation as well as an open social
                                    network. These are two things that do not necessarily fit together and were linked
                                    due to the operator’s policy.

                          In the worst case scenario, these negative aspects could have serious consequences for
                          virtual worlds as a business model. If the Lindenlabs policy fails and no other serious
                          alternative can be found, then the concept of virtual 3D worlds may suffer a major

                          Lindenlabs currently operates SL in a computing centre. The SL client is an independent
                          program that users have to install. The source code of this application was released as
                          open source. At present, efforts are also being made to release the protocol (5). The
                          hope is to develop a cross-platform standard for 3D worlds which could represent the
                          breakthrough for the acceptance of virtual worlds.

                          3.4.2 World of Warcraft
                          World of Warcraft (WoW) is a game by Blizzard Entertainment that was released in 2004.
                          Member numbers have exceeded 10 million since the beginning of 2008. It only works
                          online and is part of the MMORPG (Massively Multiplayer Online Role-Playing Game)
                          genre. This means that each player can play a specific role defined by themselves in a
                          conflict between two sides. WoW also allows user accounts to have multiple avatars with
                          various characteristics. For example, they can also act on either side of the parties
                          involved in the conflict.

                          WoW is mentioned here because it is a mass phenomenon with a very solid business
                          model behind it. It appears to deliver what people want from a Web 3D application: a high
                          degree of immersion and a very large world which can be traversed on foot or in the air.

                          3.4.3 Comparability of SL and WoW
                          There are many other examples (Everquest, EVE online or Twinity, Croquet) of the
                          phenomena seen in SL and WoW. However, none of them can be viewed as being as
                          cutting-edge, widespread or typical for the genre.

                          It must also be made clear at this stage that SL and WoW are two very different
                          constructs. For the purposes of comparison, the main traits shared by them and the
                          differences between them are listed in the following.

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                          Shared traits exist primarily in the following aspects:

                               -    3D display

                               -    Large world consisting of sub-regions through which seamless travel is possible

                               -    Persistence of worlds

                               -    Avatars used as player equivalents

                          The main differences are seen in the following aspects:

                               -    Immersion

                               -    World economy

                               -    Business model

                               -    Levelling

                               -    User-created content

                          Both camps’ advocates usually have no understanding for each other whatsoever. In the
                          most extreme cases, this even causes what can only be described as ‘religious wars.’
                          The reason for this is that classical gamers do not have any interest in Second Life. This
                          target group cannot see the point of having a virtual world without a gaming side to it. On
                          the other hand, Second Life’s target group does not want to be put into the same
                          category as gamers, favouring the ‘free,’ unconstrained nature of SL.

                          3.5. Revisited: when is a game a ‘game’ and when is it ‘serious?’
                          Is Second Life a game? The competition appears to be split where 3D worlds are
                          concerned. Although some definitely want to be a game, they also merge social and
                          communication elements with the experience.

                          If we take chatting as an example, all virtual 3D worlds allow at least text-based chatting
                          and some even allow speech-based chatting. At present, no 3D world allows video-based
                          chatting since this would have a negative effect on immersion.

                          For instance, classical multi-player games provide the option of using key combinations
                          to send predefined text messages. This strengthens game appeal since these messages
                          (voice, tonality etc.) are embedded in the game’s atmosphere. Although there is also an

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                          option of sending ‘actual’ text messages, these are only used intensively during breaks in
                          the game.

                          In MMORPGs, however, chatting is a community-promoting element. Interestingly,
                          chatting is used both in the game context and for general conversation. Chatting is a
                          genuinely popular part of the experience and increases customer loyalty.

                          Is World of Warcraft a game? There may be little doubt about this, but to attribute WoW’s
                          phenomenal success merely to its standing as a game would be to do it an injustice. In a
                          strict sense, it consists of a number of games that have different game mechanics. The
                          ‘Quests’ in particular are, to a certain extent, games within a game. These can last for
                          hours, they require teamwork and none of the team members are allowed to opt out while
                          they are in progress.

                          Outside the Quests, players build up their character but also have time for small talk. The
                          social aspect is almost inseparable from the game aspect, which is almost certainly the
                          reason behind the massive success of WoW.

                          There is a lot of discussion about whether WoW promotes social behaviour as well as
                          skills required in professional life. If this proves to be the case, WoW could certainly be
                          classed as having the characteristics of a serious game. While other parties are
                          attempting to prove the opposite, time will tell what field studies will tell us about WoW
                          and virtual worlds (7).

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                          3.6. Special case: mirror worlds
                          Mirror worlds are not used very often for
                          serious games (yet). These are 3D parallel
                          worlds that show our actual world in as much
                          detail as possible, unlike fictitious worlds (7).

                          Google Earth and Microsoft Virtual Earth are
                          two implementations for displaying the earth
                          in this way and have both compiled huge
                          volumes of data consisting of map materials and aerial photographs.

                          Both have a browser and client (a separate program for 3D display) variant. The browser-
                          based variants tend to focus on map displays whereas the applications are aimed at
                                                                         providing 3D displays that are as sophisticated
                                                                         as possible.

                                                                         Time will tell whether this medium will become
                                                                         more popular for serious games. It would, of
                                                                         course, lend itself particularly well to historical
                                                                         or geographical content. A few schools and
                                                                         universities are already taking the first steps in
                                                                         this direction by using released Google
                          Earth/Maps technologies in some lessons.

                          3.7. Special case: virtual worlds for learning
                          Surprisingly, there are no large or successful virtual worlds dedicated to learning. Virtual
                          worlds for learning are currently isolated applications and often have their origins in the
                          MUD sphere. It would appear that one either has to be involved in either gaming or
                          communities to find virtual worlds useful. The combination of learning with games does
                          not seem to be valuable enough to be of any use, commercial or otherwise.

                          However, others have recognised that this is not necessarily the case. NASA is offering a
                          reward for the creation of a virtual world for learning (in this instance: MMO, massively
                          multiplayer online educational game). The terms and conditions are relatively harsh since
                          most of the funding has to come from partners. However, if even NASA considers such
                          an undertaking to be important (9), it must surely be worthwhile.

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                          4        End Devices for Using Serious Games
                          The following figure is a timeline of the history of devices that have been used for
                          computer games:

                                                                               ***Translator’s note***:
                                                                               Konsolen = Consoles

                          In addition to PCs, the current platforms are games consoles, handhelds and

                          4.1. PCs
                          As explained previously, the core components that drive serious games and other sub-
                          areas of the multimedia sector are:

                               -    The high computing power of current standard PCs

                               -    Online flat rates from network operators

                               -    Standard 3D accelerator hardware

                          In broad terms, almost everyone has a computer suitable for serious games, even if it
                          looks like an office computer. Although current office PCs only contain simple onboard
                          graphics chips, they have an acceptable level of 3D acceleration. They cannot (and are
                          not intended to) match the performance of state-of-the-art graphics cards.

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                          4.2. Smartphones and Handhelds
                          Smartphones and handhelds use technology that requires a high degree of
                          miniaturisation coupled with low power consumption.

                          In terms of computing power, they can be compared to
                          systems from the 90s. As a result of this, many classic
                          games are now available on today’s mobile end
                          devices. Because old computer games have become
                          cool again in a ‘retro’ sense, it is necessary to mention
                          Scumm VM by LucasArts. An ambitious team of
                          developers use this virtual machine to transfer reverse-
                          engineered games to a variety of end devices
                          (including Windows Mobile, Nokia Series 60 and the

                          Unfortunately, no development environment exists for programming Scumm VM (not to
                          mention the licensing issues), meaning that this avenue is closed for serious games.

                          The general idea of establishing a virtual machine architecture has already emerged a
                          few times. The most recent example was Nokia’s N-Gage, which had its own game
                          application programming interface (API, or in other words, a game programming
                          framework). However, this was not a success due to the poor sales generated by the N-
                          Gage. Nevertheless, Nokia is making another attempt with its new N-Gage, perhaps
                          meaning that this type of VM (virtual machine) approach may be considered again in

                          Until then, development will continue to be mobile device-specific and Java or flash-

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                          4.3. Using games consoles for serious games
                          It is not possible to use consoles for serious games at present. The business models of
                          consoles work in such a way that the hardware is financed indirectly by game software
                          and the associated licenses. This prevents all and sundry from developing games for
                          consoles since both the means for production (developer kits) and the licenses are
                          subject to a certification process. The game concept must also be submitted to the
                          console manufacturers who then check it and evaluate it against certain criteria for
                          success. The development studio can only apply for a license (which is usually cost-
                          intensive) once they receive the manufacturer’s approval. However, development can
                          only begin once the studio has applied for developer kits. These can be very expensive
                          and one is required for each developer. If a console is very new, then the hardware is
                          typically only available as a ‘raw’ version which has to be connected to a PC.
                          Development cannot proceed without developer kits.

                          The entire process is very costly and is aimed at AAA game development. As such, it
                          favours large developer studios.

                          This current state of
                          affairs is just beginning
                          to change. Microsoft’s
                          Xbox 360 is the first
                          console open to
                          independent game
                          developers. These are
                          generally small scale
                          development teams that
                          develop casual games,
                          for example, and have to
                          work within small
                          budgets. Microsoft has
                          made the XNA Library available so that developers on lower budgets can produce games
                          for the Xbox and PC. The only catch here is that developers can only release these
                          games if they have direct access to the Xbox or the ‘Live Gallery.’ The console must also
                          have permanent access to the Internet. A different and simpler certification step is
                          required for the acceptance of the project in the Xbox Live Gallery. Version 2.0 of the
                          XNA Library was available as of April 2008. What is most interesting is that it supports 3D
                          functionality and does not claim to be a complete game engine. An advantage of XNA is
                          that it is also available for PCs. This makes it possible to carry out development for the
                          PC and Xbox in parallel, although there are differences in design (e.g. the fact that the

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                          console has no standard keyboard) that have to be considered when developing

                          There are also indications that Nintendo will open up the Wii console to a certain extent.
                          The developer kits are set to be available for less money than has previously been the

                          It would therefore be reasonable to expect that consoles will also eventually be opened
                          up for small serious games. This would make other target groups and user situations

                          4.4. Controllers
                          Special controllers are back in fashion after the revolution in movement games started by
                          the Nintendo Wii and its individual input devices (such as the Wiimote). Games such as
                          Guitar Hero have become hugely popular, the latter coming with plastic guitar-like
                          controllers allowing the user to play various pieces.

                          The Wii Fit game (which has a controller resembling a set of scales) is receiving a great
                          deal of attention at present. At the time of writing, ‘Wii Fit’ is being released as a
                          movement game for the Wii games console. It is not difficult to see why this game could
                          break new ground since it appears to combine physical exercise perfectly with a
                          computer game.

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                          5       Technical Realisation of Serious Games
                          As mentioned at the outset, the high performance of current home and office computer
                          systems is one of the key contributors to the increasing popularity of 3D visualisations
                          and serious games. Even non-3D realisations benefit greatly from this increase in
                          computing power. Because not only high-end systems are relevant for development, the
                          hardware and software requirements can also be met by less expensive systems.

                          The following outlines a selection of tools with which we have development experience,
                          but which are not our own developments.

                          The market for author tools is very large and the following list makes no attempt to cover
                          it in its entirety. Requirements must be identified and evaluated where actual projects are

                          We carry out evaluations for actual projects on behalf of clients.

                          5.1. 1D text adventures, interactive fiction, MUDs/MOOs
                          Although text adventures are not
                          exactly en vogue at the moment, they
                          can be useful, for example, in
                          learning environments. There are
                          various author systems for realisation
                          such as Inform (3). There are various
                          OpenSource implementations at
                          MOO level.

                          5.2. DHTML
                          Games that are very simple can be mapped using dynamic HTML. Here, HTML elements
                          are changed using JavaScript during runtime. However, the development possibilities
                          (and therefore the range of applications) are so limited that this method is really only
                          viable for text-based applications.

                          5.3. 2D, 2.5D
                          The clear winner in the 2D and 2.5D sector is Adobe (previously Macromedia) Flash. This
                          vector-based, streaming format is extremely widespread. Most games on the Internet are
                          based on Flash since trouble-free installation in web browsers is a must for users. Adobe

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                          is now set to tackle browser-independent use with Adobe Air. It will be interesting to see
                          what level of success this will achieve.

                          Microsoft Silverlight is a serious, upcoming competitor in this seemingly crucial market.
                          Although the Silverlight plug-in is not especially widespread at present, it is only a matter
                          of time as far as the user base of Microsoft’s operating systems is concerned. Silverlight
                          is the clear leader in terms of the video streaming quality options. It has also been
                          announced that DRM (Digital Rights Management) is to be implemented.

                          5.4. 3D and 3D game engines

                          5.4.1 Papervision3D
                          Papervision3D is a 3D software renderer based on Flash. This means that although it
                          uses the 2D graphics optimisation of Flash, it cannot use the 3D hardware acceleration of
                          the graphics cards. However, as previously mentioned, the high performance of today’s
                          processors means that the quality of the 3D display is still acceptable.

                          The popularity of Papervision3D with
                          developers in particular can be attributed
                          to the fact that the Flash plug-in is so
                          widespread and that they have been
                          waiting so long for 3D. Shockwave 3D is
                          produced by the same company and is
                          3D-capable as standard, but it is not as
                          widespread or as popular.

                          5.4.2 Shockwave 3D
                          While Flash implements vector-based graphics, Shockwave is the corresponding pixel-
                          based plug-in enhancement for web browsers. Shockwave 3D is a development capable
                          of displaying 3D whilst using hardware acceleration. It uses either the DirectX-7 or
                          OpenGL graphics standard for this. The fact that it is overshadowed by Flash seems
                          somewhat unfair since it was released at a time when issues such as band width and
                          graphics performance were still limitations to be reckoned with. Nevertheless, it is now
                          possible to use this technology to display even complex models. Shockwave 3D also
                          comes as standard on many computers, giving it a similarly broad base to Flash.

                          5.4.3 XNA
                          As discussed in section 4.3, Microsoft’s XNA framework can be used as a 3D engine.
                          Despite the fact that it (currently) lacks more extensive game engine functions, it is

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                          unique with regard to the development of applications in parallel for PCs and games

                          5.4.4 Torque
                          The Torque Game Engine (TGE) is a 3D game engine which can be traced back to 2001
                          when its predecessor was used to realise one of the first massive multiplayer games. The
                          fact that this makes it rather old is what makes it interesting for casual and serious games
                          that have to run on a broad base of computers. Torque’s clear advantage lies in its
                          network layer which allows very efficient multiplayer processes, thereby facilitating the
                          management of large numbers of players. The successor, TGEA, also allows the use of
                          modern shader technologies. TGE’s disadvantage is that its content pipeline (for
                          importing 3D levels, objects etc.) is highly complex, representing a steep learning curve
                          for 3D creation and programming.

                          At present, the Torque Game Engine is also being migrated to the Xbox360 as TorqueX
                          and may become one to watch with regard to games console development (see section
                          4.3). It also uses the XNA Framework.

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                          5.4.5 Unity3D

                          The Unity3D game engine has the potential to be at the cutting edge of tools used to
                          create serious games. The Danish company that produces it has deliberately positioned it
                          in this market. The development environment is currently only available for the Apple
                          Macintosh although a PC version has been announced. As with Shockwave 3D, it can
                          create stand-alone applications on a cross-platform basis for PCs and Macs. A separate
                          plug-in (which needs to be installed) can also be used to create web applications.
                          However, Unity3D makes use of features of current graphics cards, especially shaders. It
                          is therefore better suited for creating serious games that run on the current generation of

                          6       Conclusion
                          The wide availability of high-performance computer systems with high-speed 3D graphics
                          acceleration makes it possible to use 3D technologies in the form of Web 3D applications
                          on the Internet and in Extranets or Intranets. 3D immersions are becoming increasingly
                          established among end users and can be used for serious games. Manufacturers of
                          games consoles are also preparing to make their products accessible for casual and
                          serious games.

                          In addition, multi-user worlds are making new interactive concepts possible. Virtual
                          realities with user-created content are establishing social networks and enhancing
                          classical, browser-based Internet technology, whilst providing a new platform for serious

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                          White Paper

                          7       Bibliography
                          1. Masuch, Maic. (now FH Trier) BIS. [Online] http://bis.informatik.uni-

                          2. Zyda, Michael. From Visual Simulation to Virtual Reality to Games. IEEE Computer
                          society. [Online]

                          3. Novak, Matt. Paleo-Future. [Online] http://www.paleofuture.com/2008/04/auto-tutor-

                          4. Määttä, Aki. Realistic Level Design for Max Payne. Gamasutra. [Online]

                          5. A Design System for Interactive Fiction. Inform 7. [Online] http://www.inform-fiction.org.

                          6. Web 3D. Pixelpark. [Online]

                          7. Web 3D. Wikipedia. [Online] http://de.wikipedia.org/wiki/Web3D.

                          8. Scholz, Christian. Linden Lab releases first draft of the Second Life Open Grid
                          Protocol. mrtopf.de. [Online] http://mrtopf.de/blog/secondlife/linden-lab-releses-first-draft-

                          9. John Smart, Jamais Cascio, Jerry Paffendorf. Metaverse Roadmap. [Online]

                          10. Cheryl K. Olson, Heiko Gogolin. Harvard-Studie zu Videospielen - "Nichtspielen ist
                          ein Zeichen fehlender Sozialkompetenz". Spiegel Online. [Online]

                          11. Scholz, Christian. Windlight ist zurück. mrtopf.de. [Online]

Pixelpark Agentur, 2008                                                                                       Page 39/40
                          White Paper

                          12. NASA. NASA Learning Technologies Request for Information: Development of a
                          NASA-based massively multiplayer online learning game. NASA. [Online] NASA.

Pixelpark Agentur, 2008                                                                             Page 40/40

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