One of the main reasons that people all over the world enjoy playing video games is for the entertainment that it brings them. Game developers understand this and so they try to make sure that their games are as enjoyable and entertaining as possible for their intended target audience and as such many tend to look to their past games as well as ones made by other designers to see what they did right, what they did wrong and if they can incorporate certain game mechanics and techniques into their future games. In this section, we will be focusing on three of the key aspects that have helped in making video games entertaining and enjoyable to its audience in one form or another whether it be, for example, through the use of an interesting story, advanced controls or difficulty. The three key factors that will be the main focus of this chapter are appreciation, immersion, and challenge which are all interconnected in one form or another.