Top games by current player count
Current Players Peak Today   Game
 
440,274 1,013,674   Dota 2
160,612 591,274   Counter-Strike: Global Offensive
51,942 85,601   XCOM 2
35,739 60,554   Team Fortress 2
35,706 54,120   Sid Meier's Civilization V
30,085 53,561   Grand Theft Auto V
28,170 40,801   Fallout 4
27,417 51,978   ARK: Survival Evolved
24,354 51,783   Rust
23,659 38,657   Warframe

Steam Hardware & Software Survey
Steam Stats