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This is a list of all games developed by Valve Corporation, ordered by date. Release dates are proportionate to when they were added to Steam; thus, the release date may not reflect the actual game release.

*Appended to Steam upon release.

2003

Title Release date Notes
Counter-Strike September 12, 2003*
Day of Defeat September 12, 2003*
Deathmatch Classic September 12, 2003*
Half-Life September 12, 2003*
Ricochet September 12, 2003*
Team Fortress Classic September 12, 2003*
Half-Life: Opposing Force September 12, 2003*
Half-Life: Blue Shift September 12, 2003*
Counter-Strike: Condition Zero March 23, 2004
Counter-Strike: Source October 7, 2004 Remake of Counter-Strike in the Source engine.
Half-Life: Source November 16, 2004 Remake of Half-Life in the Source engine.
Half-Life 2 November 16, 2004 First Valve title to require Steam to run, digital and retail.
Half-Life 2: Deathmatch December 1, 2004
Day of Defeat: Source September 26, 2005 Remake of Day of Defeat in the Source engine.
Half-Life 2: Lost Coast October 27, 2005 Demo of Half-Life 2 with an alternate story.
Half-Life 2: Episode One June 1, 2006
Garry's Mod November 29, 2006
Half-Life 2: Episode Two October 10, 2007
Portal October 10, 2007
Team Fortress 2 October 10, 2007
The Orange Box October 10, 2007 Game bundle including Half-Life 2, Half-Life 2: Episode One, Half-Life 2: Episode Two, Team Fortress 2 and Portal.
Counter-Strike Online January 2008
Left 4 Dead November 17, 2008
Left 4 Dead 2 November 17, 2009
Alien Swarm July 19, 2010
Portal 2 April 18, 2011
Counter-Strike: Global Offensive August 21, 2012
Dota 2 July 9, 2013
Counter-Strike Online 2 2013
Counter-Strike Nexon: Zombies October 7, 2014
Left 4 Dead: Survivors December 10, 2014
The Lab April 5, 2016
Artifact November 28, 2018
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