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Fire. Wait. Thud. Start with a pistol on a firing range and work up to artillery across a valley a kilometre long. Every hit pays, every upgrade is felt on the next shot, and every new weapon brings its own targets: balloon bunches, squads, convoys, bomber formations, alien swarms.

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