Turtle Rock Studios

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Turtle Rock Studios
Industry Computer and video games
Interactive entertainment
Founded March 2002
Founder Michael Booth
Phil Robb (co-founder)
Chris Ashton (co-founder)
Headquarters Lake Forest, California, U.S.
Products Left 4 Dead series
Counter-Strike series (2003-2004)
Parent Independent (2002-2008, 2009-present)
Valve (2008-2009)
Website www.turtlerockstudios.com

Turtle Rock Studios is an American video game developer founded in March 2002 by Michael Booth, and was acquired by Valve Corporation in 2008. In 2009, Turtle Rock went independent and was re-founded by Chris Ashton and Phil Robb. Turtle Rock Studios is involved in the creation of original titles as well as the provision of consulting services to the digital entertainment industry.


On November 20, 2006, Turtle Rock Studios announced Left 4 Dead, a co-operative multiplayer action game. The game was built atop the most advanced version of the Source Engine available at the time and introduced version 2 of Turtle Rock's AI technology, which had since been updated from the AI used for the bots in Condition Zero. The game released on Microsoft Windows and the Xbox 360 in November 2008.[1] On 10 January 2008, Valve Corporation announced that they had acquired Turtle Rock Studios.[2] Valve took control of development since then.[3]

Later in 2008, Valve shut down Turtle Rock Studios and let all the personnel relocate to Seattle to join them if they wanted to.[4] On 3 June 2009, Doug Lombardi of Valve Corporation confirmed that the studio was no longer operating as Valve South some time after the release of Left 4 Dead.[4] After formally being closed the remaining team members developed an iPhone automotive maintenance app named Garage Buddy and on 5 February 2010, Turtle Rock Studios put up a new website declaring they have reformed and are once again working on video games.[5]

On 2 June 2010, Turtle Rock Studios announced the formation of a new division in Turtle Rock called Turtle Rock Garage, a small division based solely on casual games.[6] On 22 September 2010, Digital Development Management announced they are representing Turtle Rock Studios to find publishers for their games.[7]

On 9 February 2011, Turtle Rock Studios announced they have begun aggressive hiring for their next major title. On 26 May 2011, THQ announced they would be publishing Turtle Rock's next major title.[8] On 10 June 2011, THQ described Turtle Rock's next title as 'Wild'. THQ core game boss Danny Bilson confirmed that a full reveal of the shooter is due.[9]

On 20 October 2011, Turtle Rock confirmed that their next title will be powered by CryEngine 3.[10] On 23 January 2013, Take-Two Interactive acquired the rights to the current game, listed as Evolve, in the THQ Bankruptcy Auction, with subsidiary 2K Games to publish the game.[11] On 1 May 2014, Turtle Rock Studios publicly fired their community manager Josh Olin in direct response to his tweet that Donald Sterling has a right to free speech.[12]

List of games[edit]

Turtle Rock Studios is best known for their work on Valve Corporation's Counter-Strike and Left 4 Dead franchises. Works include:

Year Game Publisher Platform(s)
Win Mac Lin Xbox X360 PS4 XBO iOS Android
2003 Counter-Strike (Xbox port) Valve Corporation No No No Yes No No No No No
2004 Counter-Strike: Condition Zero Valve Corporation Yes Yes Yes No No No No No No
2004 Counter-Strike: Source (various maps) Valve Corporation Yes Yes Yes No No No No No No
2004 Half-Life 2: Deathmatch (Halls3 Map) Valve Corporation Yes Yes Yes No No No No No No
2008 Left 4 Dead Valve Corporation Yes Yes No No Yes No No No No
2009 Left 4 Dead 2: The Passing Valve Corporation Yes Yes Yes No Yes No No No No
2010 Left 4 Dead: The Sacrifice Valve Corporation Yes Yes No No Yes No No No No
2010 Left 4 Dead 2: The Sacrifice Valve Corporation Yes Yes Yes No Yes No No No No
2011 Leap Sheep! Turtle Rock Studios No No No No No No No Yes Yes
2015 Evolve 2K Games Yes No No No No Yes Yes No No


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