Top games by current player count
Current Players Peak Today   Game
 
681,446 1,080,658   Dota 2
205,722 605,131   Counter-Strike: Global Offensive
42,531 99,424   XCOM 2
37,031 62,274   Team Fortress 2
33,631 52,129   Grand Theft Auto V
26,794 56,595   Sid Meier's Civilization V
25,884 73,404   Football Manager 2016
24,434 53,453   Rust
21,494 53,214   ARK: Survival Evolved
20,666 39,300   Warframe

Steam Hardware & Software Survey
Steam Stats