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Colony Sim. Assembly Required. Program real 1980s 65C02 microprocessors inside cute 8-bit robots to mine crystals, fortify your base, and survive a lethal alien planet where every clock cycle burns watts. Tweak starter code, write your own OS, or flash boot disks.

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