Top games by current player count
Current Players Peak Today   Game
 
306,645 1,080,658   Dota 2
252,670 605,131   Counter-Strike: Global Offensive
76,415 99,424   XCOM 2
48,623 62,274   Team Fortress 2
45,723 56,595   Sid Meier's Civilization V
40,139 53,214   ARK: Survival Evolved
39,609 73,404   Football Manager 2016
37,195 46,464   Garry's Mod
35,538 43,748   Fallout 4
35,080 53,453   Rust

Steam Hardware & Software Survey
Steam Stats