Top games by current player count
Current Players Peak Today   Game
 
1,002,917 1,127,317   Dota 2
356,996 657,283   Counter-Strike: Global Offensive
54,793 133,106   XCOM 2
49,153 77,861   Team Fortress 2
44,946 63,277   Grand Theft Auto V
41,645 75,505   Football Manager 2016
35,212 61,467   Rust
33,177 75,066   Sid Meier's Civilization V
30,523 62,485   ARK: Survival Evolved
28,212 64,976   Garry's Mod

Steam Hardware & Software Survey
Steam Stats