Purgater is a 3D roguelike morbid turn-based strategy game with board and card game elements. It takes place in Purgatory, whose environment is created from biological materials such as blood. Sinful Cards are the only entertainment for the inhabitants in the seemingly procedurally generated floors. The worst sinners survive in obscurity, and one of them decides to put an end to his bitter fate. Searching for familiar earthly associations, he deciphers the unknown language of the world. By absorbing the sins of others, he gains mutating power and thus becomes stronger and more dangerous. Therefore, he does not escape the constant attention of the Jailer, the Warden of Purgatory himself.