Top games by current player count
Current Players Peak Today   Game
 
453,062 893,125   Dota 2
166,545 589,799   Counter-Strike: Global Offensive
42,015 68,537   XCOM 2
39,886 59,366   Team Fortress 2
36,032 51,027   Sid Meier's Civilization V
33,974 57,385   Grand Theft Auto V
27,652 50,109   ARK: Survival Evolved
27,132 38,179   Fallout 4
27,017 36,346   Warframe
26,354 50,853   Rocket League

Steam Hardware & Software Survey
Steam Stats