"Progression is an important part of a game's design and its purpose is to keep people motivated to continue playing. Each genre handles progression differently, for example beating a map in a strategy game or achieving positive growth in a city builder. There are two categories of progression: player based and game based. Player based is the player improving at the title while game based is the designer providing hooks to keep the player invested. For this post, we're going to ignore player based as I want to focus on the ways designers can keep someone playing."