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

Joined

Portal
Portal
Team Fortress 2
Team Fortress 2
Source Filmmaker
Source Filmmaker
Valve
Valve
LambdaGeneration
LambdaGeneration
Garry's Mod
Garry's Mod
Half-Life
Half-Life