http://store.steampowered.com/stats/

Top games by current "STEAM" player count

(Current Players) (Peak Today) Game

347,055 755,168 Dota 2
60,756 258,321 Counter-Strike: Global Offensive
32,080 76,791 Team Fortress 2
17,350 40,223 Sid Meier's Civilization V
14,698 37,033 The Elder Scrolls V: Skyrim
13,391 31,757 The Binding of Isaac: Rebirth
11,656 67,105 Football Manager 2015
11,337 36,880 Garry's Mod
10,440 20,184 Warframe
9,571 27,057 PAYDAY 2
6,921 23,277 DayZ
6,419 27,346 Arma 3
5,730 14,368 Sid Meier's Civilization: Beyond Earth
5,616 28,693 Call of Duty: Advanced Warfare - Multiplayer
5,541 30,895 Counter-Strike
5,296 17,561 Borderlands: The Pre-Sequel
5,214 27,794 Football Manager 2014
4,710 15,157 Total War: ROME II - Emperor Edition
4,671 10,958 Left 4 Dead 2
4,583 10,514 Terraria
4,236 19,839 Counter-Strike: Source
3,940 10,732 Borderlands 2
3,899 14,014 Arma 2: Operation Arrowhead
3,816 12,208 War Thunder
3,575 11,702 Europa Universalis IV
3,205 5,266 FINAL FANTASY XIV: A Realm Reborn
3,008 12,886 Robocraft
3,000 5,534 Tom Clancy's Ghost Recon Phantoms - NA
2,925 6,123 Insurgency
2,901 6,344 Fallout: New Vegas
2,873 5,060 Valkyria Chronicles™
2,822 11,034 Unturned
2,691 7,673 Rust
2,673 6,365 Path of Exile
2,409 6,047 XCOM: Enemy Unknown
2,261 7,994 Mount & Blade: Warband
2,259 10,850 Farming Simulator 15
2,143 4,425 Kerbal Space Program
2,002 4,583 PlanetSide 2
2,000 7,979 Heroes & Generals
1,969 3,997 7 Days to Die
1,941 7,126 Company of Heroes 2
1,941 5,005 DARK SOULS™ II
1,874 5,048 Neverwinter
1,832 4,010 NBA 2K15
1,823 5,747 Middle-earth: Shadow of Mordor
1,820 6,799 Call of Duty: Advanced Warfare
1,818 4,554 Space Engineers
1,813 4,808 Crusader Kings II
1,807 4,853 The Binding of Isaac
1,667 7,804 Euro Truck Simulator 2
1,629 3,627 Just Cause 2
1,622 3,253 Marvel Heroes 2015
1,582 3,942 Banished
1,493 3,455 Don't Starve
1,466 3,269 Star Trek Online
1,448 3,753 Total War: SHOGUN 2
1,419 4,853 Empire: Total War
1,403 4,216 Age of Empires II: HD Edition
1,350 7,177 Counter-Strike Nexon: Zombies
1,233 2,412 Risk of Rain
1,220 2,746 Killing Floor
1,193 3,513 Wasteland 2
1,192 2,620 RIFT™
1,177 9,144 Call of Duty: Black Ops II - Multiplayer
1,171 2,252 Dragon Age: Origins - Ultimate Edition
1,159 2,259 Saints Row IV
1,108 1,689 Rogue Legacy
1,090 2,369 Starbound
1,058 6,418 Football Manager 2013
1,050 3,641 The Forest
978 6,310 Call of Duty: Modern Warfare 3 - Multiplayer
973 2,881 Divinity: Original Sin
943 3,080 APB Reloaded
933 2,171 Stronghold Kingdoms
924 1,802 FTL: Faster Than Light
908 2,655 Chivalry: Medieval Warfare
834 6,514 Tom Clancy's Ghost Recon Phantoms - EU
819 2,510 Far CryR 3
805 2,488 Wolfenstein: The New Order
792 1,914 The Sims(TM) 3
771 3,409 Metro 2033
760 2,677 Infestation: Survivor Stories
753 1,800 Dark Souls: Prepare to Die Edition
753 1,281 Ultra Street Fighter IV
731 1,969 Portal 2
725 1,855 Defiance
724 1,395 ArcheAge
722 1,997 Firefall
720 2,702 Company of Heroes (New Steam Version)
713 1,429 EVE Online
708 1,434 Wakfu
692 2,235 Just Cause 2: Multiplayer Mod
654 959 Aura Kingdom
644 2,050 Life is Feudal: Your Own
629 1,398 Endless Legend
625 1,714 Assassin's Creed IV Black Flag
624 1,703 Medieval II: Total War
602 1,403 The Mighty Quest For Epic Loot
596 2,525 LEGO MARVEL Super Heroes