Singleplayer
Grand Theft Auto V, The Witcher 3: Wild Hunt, Portal 2, Tomb Raider (2013), Portal, Left 4 Dead 2
Steam Achievements
Grand Theft Auto V, Portal 2, Counter-Strike: Global Offensive, Portal, Left 4 Dead 2, The Elder Scrolls V: Skyrim
Multiplayer
Grand Theft Auto V, Portal 2, Tomb Raider (2013), Counter-Strike: Global Offensive, Left 4 Dead 2, Borderlands 2
Full controller support
Grand Theft Auto V, The Witcher 3: Wild Hunt, Portal 2, Tomb Raider (2013), Counter-Strike: Global Offensive, Left 4 Dead 2
Atmospheric
Grand Theft Auto V, The Witcher 3: Wild Hunt, Portal 2, Tomb Raider (2013), Portal, The Elder Scrolls V: Skyrim
Steam Cloud
Portal 2, Left 4 Dead 2, The Elder Scrolls V: Skyrim, BioShock Infinite, Borderlands 2, Half-Life 2
steam-trading-cards
Portal 2, Counter-Strike: Global Offensive, Left 4 Dead 2, The Elder Scrolls V: Skyrim, BioShock Infinite, Borderlands 2
Great Soundtrack
Grand Theft Auto V, The Witcher 3: Wild Hunt, Portal, The Elder Scrolls V: Skyrim, BioShock Infinite, Life is Strange
RPG
Grand Theft Auto V, The Witcher 3: Wild Hunt, Tomb Raider (2013), The Elder Scrolls V: Skyrim, BioShock Infinite, Borderlands 2
Co-op
Grand Theft Auto V, Portal 2, Counter-Strike: Global Offensive, Left 4 Dead 2, Borderlands 2, Red Dead Redemption 2