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Reactor 13 is chaotic local co-op for 1–4 players. Grab, wash, charge, and craft Dark Matter blocks to power everything from one house up to a whole planet. Overcharge for huge output; the chain reactions are half the fun, the meltdown is not. Play solo or have someone else to blame.

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