Half-LifePortalTeam Fortress 2Source FilmmakerValveBlack MesaLambdaGenerationSven Co-opEntropy : ZeroGarry's ModCounter-Strike: Global OffensiveLeft 4 Dead

Joined

Garry's Mod
Garry's Mod
Team Fortress 2
Team Fortress 2
Sven Co-op
Sven Co-op
Black Mesa
Black Mesa
Valve
Valve
Portal
Portal
Half-Life
Half-Life