Of course, this exploration of what players want could fill an entire book. I encourage readers, whether aspiring game designers or those who have already had a number of games published, to create their own lists of what they think gamers want. Think of what frustrates you while you play a game and what parts of a given game give you the greatest satisfaction. Then try to determine why you react to a game mechanic as you do. What did it do right and what did it do wrong? This will allow you to establish your own list of rules, which you can then apply to your own designs. These rules will be part of what makes your games uniquely your own. Without feedback from playtesters it is often hard to determine whether your game is entertaining and compelling or not. But with a set of rules you can systematically apply to your design, you may be able to figure out whether anyone will like the completed game.