Keller: a turn-based roguelike in the cellars under the city. The lights have gone out, and the main fuse, the Hauptsicherung, is five floors down. You carry a lantern; you only see what it lights, and you remember what you have seen. Each move you make, the creatures of the cellar move too: rats, moths that dim the lantern, spiders in their webs, shadows that only show up close, and guards. Walk into a creature to fight it, pick up bread, oil, coffee and bandages on the way, find the key on the deeper floors, and throw the fuse on floor five. Arrow keys, WASD, the numeric keypad or the vi keys move; tapping a tile walks there. The same seed always builds the same cellar.