Valve Software (22)
- CounterStrikeRelease Date: 09 Nov, 2000
- CounterStrike: Condition ZeroRelease Date: 21 Mar, 2004
- CounterStrike: SourceRelease Date: 07 Oct, 2004
- Day of DefeatRelease Date: 06 May, 2003
- Day of Defeat: SourceRelease Date: 10 Oct, 2009
- Half LifeRelease Date: 19 Nov, 1988
- Half Life 2Release Date: 16 Nov, 2004
- Half Life 2: Episode 1Release Date: 01 Jun, 2006
- Half Life 2: Episode 2Release Date: 26 Oct, 2007
- Half Life 2: Lost CoastRelease Date: 29 Oct, 2005
- Half Life: Blue ShiftRelease Date: 05 Apr, 2001
- Half Life: Counter-StrikeRelease Date: 09 Nov, 2000
- Half Life: Opposing ForceRelease Date: 01 Nov, 1999
- Left 4 DeadRelease Date: 18 Nov, 2008
- Left 4 Dead 2Release Date: 17 Nov, 2009
- Orange Box, TheRelease Date: 26 Oct, 2007
- PortalRelease Date: 19 Oct, 2007
- Sin Episodes: EmergenceRelease Date: 10 May, 2006
- Team Fortress 2Release Date: 19 Oct, 2007
- Team Fortress ClassicRelease Date: 07 Apr, 1999