Cataclysm: Dark Days Ahead

Cataclysm: Dark Days Ahead, is an open-source survival horror roguelike video game. Cataclysm: Dark Days Ahead is a fork of the original game Cataclysm.

The game is set in near-future New England after a catastrophic event killed most of the human population and spawned various monsters and hazards. Though the cataclysm is predominantly a zombie apocalypse, many other disastrous events are going on, including invasions from fungi, Triffids, Lovecraftian monsters and caves containing sewer rats and a rat king.