Wandrils: Guidebook for the Recently Exiled

From the introduction:

WANDRILS is a fantasy role-playing game in which you and your friends take on the role of condemned amnesiacs struggling to adapt or escape from a mysterious extra-dimensional prison. As they overcome monsters and obstacles, discover their own strength, and forge connections with fellow exiles, they can eventually recover their old memories and plot their escape. This game uses a unique set of rules, some familiar to experience role-players, and some not. Later chapters will explain them and arm you with the ability to grasp their use in the game.