Counter-Strike

Team Fortress Classic

Day of Defeat

Deathmatch Classic

Half-Life: Opposing Force

Ricochet

Half-Life

Counter-Strike: Condition Zero

Half-Life: Blue Shift

Half-Life 2

Counter-Strike: Source

Half-Life: Source

Day of Defeat: Source

Half-Life 2: Deathmatch

Half-Life 2: Lost Coast

Half-Life Deathmatch: Source

Half-Life 2: Episode One

Portal

Half-Life 2: Episode Two

Team Fortress 2

Left 4 Dead 2

Dota 2

Portal 2

Counter-Strike: Global Offensive

Red Orchestra: Ostfront 41-45

Killing Floor

Darwinia

Uplink

DEFCON

Earth 2160

Two Worlds Epic Edition

X3: Reunion

X3: Terran Conflict

X Rebirth

Psychonauts

Garry's Mod

Medieval II: Total War™

Medieval II: Total War™ Kingdoms

Natural Selection 2

Shank