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Games Developed and Released by Valve Software

Left 4 Dead 2: The Passing
April 22, 2010
75
Left 4 Dead 2: The Passing
Left 4 Dead 2
November 17, 2009
89
Left 4 Dead 2
Left 4 Dead: Crash Course
September 29, 2009
76
Left 4 Dead: Crash Course
Left 4 Dead
November 18, 2008
89
Left 4 Dead
Day of Defeat: Source
September 26, 2005
81
Day of Defeat: Source
Counter-Strike: Source
October 7, 2004
88
Counter-Strike: Source
Day of Defeat
May 6, 2003
78
Day of Defeat
Half-Life: Opposing Force
November 18, 1999
Half-Life: Opposing Force