Top games by current player count
Current Players Peak Today   Game
 
578,706 962,976   Dota 2
519,380 594,657   Counter-Strike: Global Offensive
74,576 85,534   XCOM 2
68,029 70,594   Football Manager 2016
51,903 58,398   Team Fortress 2
51,081 54,120   Sid Meier's Civilization V
49,312 50,335   ARK: Survival Evolved
44,825 48,267   Rust
42,715 56,347   Grand Theft Auto V
38,849 40,801   Fallout 4

Steam Hardware & Software Survey
Steam Stats