This chapter will provide an overview and strength of games as well as examining the element of fun influencing gamers’ behaviour in games. The development of sophisticated algorithms and the increased coverage of the internet help electronic games succeed and increase, overflowing the traditional boundaries in which they were traditionally confined. As the game industry enjoys continual and rapid growth in the market, it is important to examine the features that make games so attractive and keep players coming back for more. Professional game designers often take it for granted that people just want to play their games, rarely examining the psychology of their gaming audience. Hence, the aim of this chapter is to focus on the psychology of gaming examining the subjective element of fun and a tool to measure behaviours of players in a game.