There is no unifying theory of game design. To create games, we ne draw upon the art and science of psychology, mathematics, story telling and interaction design. Here are five factors to consider. For each factor, i'll show you how we use it as superhuman and how you can use it on your own products. Firstup, goals. In fact, goals are a defining feature of games. But we can't just have any old goals. We need good goals. And for a game, good goals are concrete, achievable and rewarding. When superhuman, we a very concrete goal, get to n box zero. Good goals must also be achievable. This is one of the main reasons