Top games by current player count
Current Players Peak Today   Game
 
575,113 893,125   Dota 2
171,425 589,799   Counter-Strike: Global Offensive
37,687 59,366   Team Fortress 2
36,827 57,385   Grand Theft Auto V
35,319 68,537   XCOM 2
30,068 51,027   Sid Meier's Civilization V
24,137 36,346   Warframe
23,875 47,470   Rust
23,661 50,109   ARK: Survival Evolved
22,523 38,179   Fallout 4

Steam Hardware & Software Survey
Steam Stats