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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.

1998[]

Title Release date Notes
Half-Life November 19th, 1998* This game was revolutionary at its time. It was the first game to actually tell a story in the game.
Half-Life: Uplink February 12th, 1999. A demo of Half-Life 1.
Team Fortress Classic April 1st, 1999
Half-Life: Opposing Force November 1st, 1999* The 1st expansion pack to Half Life 1.
Counter-Strike November 1st, 2000 Valve acquired the rights to Counter-Strike and released a retail version called "Counter-Strike 1.0."
Ricochet Novemer 1st, 2000
Deathmatch Classic June 1st, 2001 Basically Quake Deathmatch but in Half-Life.
Half-Life: Blue Shift June 1st, 2001 The 2nd expansion pack to Half-Life.
Half-Life: Decay November 14th, 2001 A PS2 Expansion Pack to the game Half Life.
Day of Defeat May 1st, 2003* Originally a mod for Half-Life, Valve acquired and released a standalone version.
Counter-Strike: Condition Zero March 1st, 2004
Counter-Strike: Condition Zero Deleted Scenes March 23rd, 2004 Condition Zero Deleted Scenes is one of the only Counter-Strike games to kind of have a story.
Half-Life: Source June 1st, 2004 Remake of Half-Life in the Source engine.
Counter-Strike: Source November 1st, 2004 Developed by Valve and Ritual Entertainment. Source remaster of Counter Strike.
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 A tech demo showcasing high-dynamic-range rendering.
Half-Life 2: Episode One June 1, 2006 A game that shows what happens after Half-Life 2.
Half-Life 2: Episode Two October 10, 2007 A game that shows what happens after Half-Life 2: Episode 1.
Portal October 10, 2007 A puzzle game inspired by Narbacular Drop.
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 Basically a free version of Counter Strike.
Left 4 Dead November 17, 2008
Left 4 Dead 2 November 17, 2009
Alien Swarm July 19, 2010 Originally a mod, Valve released a Source engine remake as a standalone game.
Portal 2 April 18, 2011 Portal 2 is considered the "Family Friendly" Valve game.
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 A collection of VR experiments and games.
Artifact November 28, 2018 A digital collectible card game set in the Dota 2 universe.
Dota Underlords June 20th, 2019 An auto-battler strategy game set in the Dota 2 universe.
Half-Life: Alyx March 23, 2020 A VR prequel to the popular game Half Life 2.
Counter-Strike 2 September 27th, 2023 Originally Counter-Strike: Global Offensive has turned into a game made in the source 2 engine.
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