1 INTRODUCTION
The 21st century has been a witness to a great improvement in game industry. Computer and
video games have become one of the fastest growing and most economically successful kinds of
software. The worldwide market for these games, interactive entertainment hardware and software
is expected to grow rapidly. In the US alone, retail sales of video game, hardware, software
and accessories grew annually 10% in the last few years (RocResearch 2004). In addition, the
industry continues to grow at an incredible rate, bringing in more than $10 billion in revenue in
2009. What even more surprising is that only $500 million of that came from computer game
sales; the majority of gamers in 2009 were still spending their money on traditional consoles and
accessories (Jackson 2011). Furthermore, Jackson also wrote in his article (Video Game Industry
Statistics): ―The point, though, is that even my stepfather, a man who otherwise spends every
waking hour in the office or on his boat, has played video games. Who hasn't?‖
There are many elements which have contributed to those achievements in the game industry.
The one that should be mentioned is the development of technologies. However, while technologies
have been improved rapidly, Game Design has evolved slowly. In fact, according to Zaphiris
and Ang, many Game Designers face the fact that creating a game which can be easily learned,
effectively played, and enjoyed is the real challenge. Since the limitation of data, and the lack of
theoretical foundation in Game Design, most of games have been developed based solely on
own experiences and intuitions of the Designer. As the result, about 80% of games fail on the
market every year. (Game Software Industry Report in AlienBrain product catalog. NxN software.
2001)