List of games developed by Valve

Valve Corporation is an American video game developer and publisher founded in 1996 by former Microsoft employees Gabe Newell and Mike Harrington and currently based in Bellevue, Washington. The studio is known for their first-person shooter series, including Half-Life, Counter-Strike, Team Fortress, and Day of Defeat. All games released by Valve use one of two engines of their own creation - the Quake-based GoldSRC or its successor, Source.

Half-Life

Half-Life Original release date(s): NA November 19, 1998	Release years by system: 1998 – Microsoft Windows 2001 - PlayStation 2
	Notes: Valve's first video game. Ported to the PlayStation 2 in 2001 along with the co-operative game Half-Life: Decay. Ported to the Source engine and released on Windows as Half-Life: Source in 2004.
Half-Life: Opposing Force Original release date(s): NA November 1, 1999 EU November 15, 1999	Release years by system: 1999 – Microsoft Windows
	Notes: Developed with Gearbox Software. The first expansion pack for Half-Life.
Half-Life: Blue Shift Original release date(s): NA June 12, 2001	Release years by system: 2001 – Microsoft Windows
	Notes: Developed with Gearbox Software. The second expansion pack for Half-Life.
Half-Life Deathmatch: Source Original release date(s): NA July 2, 2005	Release years by system: 2005 – Microsoft Windows
	Notes: Source engine port of the multiplayer component to the original Half-Life.
Half-Life: Decay – PS2	Notes: included in PS2's Half-Life.

Promotional releases

Half-Life: Day One Original release date(s): 1998	Release years by system: 1998 – Microsoft Windows
	Notes: Demo for Half-Life packaged with certain graphics cards.
Half-Life: Uplink Original release date(s): February 12, 1999	Release years by system: 1999 – Microsoft Windows
	Notes: Demo for Half-Life which includes levels and areas not present in the full game.

Half-Life 2

Half-Life 2 Original release date(s): NA November 16, 2004 EU November 16, 2004	Release years by system: 2004 - Microsoft Windows 2005 - Xbox 2007 - Xbox 360, PlayStation 3 2010 - Mac OS X
	Notes: Sequel to the original Half-Life. Bundled with The Orange Box, which was released on PC, Xbox 360, and PlayStation 3 in 2007. After receiving an overhaul update to the last Source Engine build, it was released on Mac in 2010.
Half-Life 2: Deathmatch Original release date(s): NA December 1, 2004	Release years by system: 2004 - Microsoft Windows 2010 - Mac OS X
	Notes: Multiplayer component to Half-Life 2 released separately from the main game.
Half-Life 2: Lost Coast Original release date(s): NA October 27, 2005	Release years by system: 2005 - Microsoft Windows
	Notes: Promotional tech demo showcasing the high dynamic range lighting capabilities of the Source engine.
Half-Life 2: Episode One Original release date(s): NA June 1, 2006	Release years by system: 2006 - Microsoft Windows 2007 - Xbox 360, PlayStation 3 2010 - Mac OS X
	Notes: The first installment in a planned trilogy of sequels to Half-Life 2. Bundled with The Orange Box, which was released on PC, Xbox 360, and PlayStation 3 in 2007.
Half-Life 2: Episode Two Original release date(s): NA October 10, 2007 EU October 18, 2007 AUS October 25, 2007	Release years by system: 2007 - Microsoft Windows, Xbox 360, PlayStation 3 2010 - Mac OS X
	Notes: The second installment in a planned trilogy of sequels to Half-Life 2. Bundled with The Orange Box, which was released on PC, Xbox 360, and PlayStation 3 in 2007.

Counter-Strike

Counter-Strike Original release date(s): NA November 8, 2000	Release years by system: 2000 – Microsoft Windows 2004 – Xbox
	Notes: Multiplayer first-person shooter modification of the original Half-Life.
Counter-Strike: Condition Zero Original release date(s): NA March 20, 2004	Release years by system: 2004 – Microsoft Windows, Xbox
	Notes: Developed with Gearbox Software, Ritual Entertainment, Rogue Entertainment, and Turtle Rock Studios. Follow-up to Counter-Strike which includes single-player missions.
Counter-Strike: Source Original release date(s): NA October 7, 2004	Release years by system: 2004 – Microsoft Windows 2010 - Mac OS X
	Notes: Source engine remake of the original Counter-Strike.
Counter-Strike: Global Offensive Original release date(s): NA Q1, 2012	Release years by system: 2012 – Microsoft Windows, Xbox 360, Mac, PlayStation 3
	Notes: Will be a downloadable title on Xbox 360 and PlayStation 3.

Team Fortress

Team Fortress Classic Original release date(s): NA April 7, 1999	Release years by system: 1999 – Microsoft Windows
	Notes: Class-based multiplayer shooter adapted from the Quake modification Team Fortress.
Team Fortress 2 Original release date(s): NA October 10, 2007 EU October 18, 2007 AUS November 22, 2007	Release years by system: 2007 – Microsoft Windows, Xbox 360, PlayStation 3 2010 -- Mac OS X
	Notes: Sequel to Team Fortress Classic. Bundled with The Orange Box, which was released on PC, Xbox 360, and PlayStation 3 in 2007. Now free on - Steam.

Day of Defeat

Day of Defeat Original release date(s): NA May 1, 2003	Release years by system: 2003 – Microsoft Windows
	Notes: World War II-based multiplayer shooter modification of the original Half-Life.
Day of Defeat: Source Original release date(s): NA September 26, 2005	Release years by system: 2005 – Microsoft Windows 2010 - Mac OS X
	Notes: Source engine remake of Day of Defeat.

Portal

Portal Original release date(s): NA October 10, 2007 EU October 18, 2007 AUS November 18, 2007	Release years by system: 2007 – Microsoft Windows, Xbox 360, PlayStation 3 2010 – Mac OS X
	Notes: Physics-based first-person puzzle game developed by graduates of DigiPen Institute of Technology. Bundled with The Orange Box, which was released on PC, Xbox 360, and PlayStation 3 in 2007.
Portal 2 Original release date(s): NA April 19, 2011 EU April 21, 2011 AUS April 21, 2011	Release years by system: 2011 – Microsoft Windows, Xbox 360, Mac OS X, PlayStation 3
	Notes: Sequel to Portal. First Valve game developed for the PlayStation 3 by Valve and the first console version of a Valve game to feature Steam and Steamworks.

Left 4 Dead

Left 4 Dead Original release date(s): NA November 18, 2008 EU November 21, 2008	Release years by system: 2008 – Microsoft Windows, Xbox 360 2010 – Mac OS X
	Notes: Co-operative shooter set in the zombie apocalypse.
Left 4 Dead 2 Original release date(s): NA November 17, 2009 EU November 20, 2009	Release years by system: 2009 – Microsoft Windows, Xbox 360 2010 – Mac OS X
	Notes: Sequel to Left 4 Dead.

Other games

Deathmatch Classic Original release date(s): NA June 11, 2000	Release years by system: 2000 – Microsoft Windows
	Notes: Multiplayer modification of the original Half-Life.
Ricochet Original release date(s): NA November 1, 2000	Release years by system: 2000 – Microsoft Windows
	Notes: Multiplayer modification of the original Half-Life.
The Orange Box Original release date(s): NA October 9, 2007 EU October 19, 2007 AUS October 25, 2007	Release years by system: 2007 – Microsoft Windows, Xbox 360, PlayStation 3 2010 – Mac OS X
	Notes: Compilation including Half-Life 2, Half-Life 2: Episode One and Episode Two, Team Fortress 2, and Portal. PlayStation 3 version's development was outsourced to Electronic Arts due to Valve being a critic of the PS3 hardware at the time.
Alien Swarm Original release date(s): NA July 19, 2010 EU July 19, 2010	Release years by system: 2010 – Microsoft Windows
	Notes: A remake of the Alien Swarm mod for Unreal Tournament 2004 on the Source engine made by the developers between other projects after they were hired by Valve. Released for free via Steam with access to the complete code base to help developers creating Source engine mods.
Dota 2 Original release date(s): NA 2012 EU 2012 AUS 2012 (Tentative)	Release years by system: 2012 – Microsoft Windows, Mac OS X
	Notes: Planned sequel to Defense of the Ancients. Valve's first real-time strategy game.

References

• "Valve - Games". Valve Corporation. http://www.valvesoftware.com/games.html. Retrieved 2010-01-25. 

Valve games Half-Life series Half-Life (Opposing Force · Blue Shift · Decay)  · Half-Life 2 (Episode One · Episode Two · Episode Three) Portal series Portal · Portal 2 Counter-Strike series Counter-Strike · Condition Zero · Source · Neo · Online · Global Offensive Day of Defeat series Day of Defeat · Source Team Fortress series Team Fortress Classic · Team Fortress 2 Left 4 Dead series Left 4 Dead · Left 4 Dead 2 Other games Deathmatch Classic · Ricochet · The Orange Box · Alien Swarm · Dota 2