Bright Night has a single, linear timeline in a single universe, just with multiple "dimensions", only one of which will have Earth in it. Yet, there are clear time travel case with "Challenge - Medieval Peasant". Consider this as unknown anomaly. While some have described it as a "zombie game", there is far more to Cataclysm: Bright Nights than that. Struggle to survive in a harsh, persistent, procedurally generated world. Scavenge the remnants of a dead civilization for food, equipment, or, if you are lucky, a vehicle with a full tank of gas to get you the hell out of there. Fight to defeat or escape from a wide variety of powerful monstrosities, from zombies to giant insects to killer robots and things far stranger and deadlier, and against the others like yourself, who want what you have. Find a way to stop the Cataclysm... or become one of its strongest monsters.