Top games by current player count
Current Players Peak Today   Game
 
968,442 1,094,007   Dota 2
456,906 651,028   Counter-Strike: Global Offensive
88,859 130,183   XCOM 2
61,513 79,396   Team Fortress 2
54,332 66,924   Football Manager 2016
49,559 62,024   Grand Theft Auto V
46,198 72,996   Sid Meier's Civilization V
45,315 57,747   Rust
40,208 57,532   Fallout 4
39,289 59,358   ARK: Survival Evolved

Steam Hardware & Software Survey
Steam Stats