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Top-down co-op survival action RPG for 1–4 players in a world the System turned into a game. Earn levels, quests and psychic powers, scavenge the ruins, fight zombies and build an underground bunker for survivors — then find out what the System really wants.

Player counts over time, as we observed them.
Source: Steam Web API, ISteamUserStats/GetNumberOfCurrentPlayers. Full methodology