Turtle Rock Studios
| Company type | Private |
|---|---|
| Industry | Video games |
| Founded | March 2002 |
| Founder | Mike Booth |
| Headquarters | United States , United States |
Area served | Worldwide |
Key people | Phil Robb, Chris Ashton |
| Products | Left 4 Dead, Evolve, Back 4 Blood |
Number of employees | 75+ (2014) |
| Parent | Slamfire Inc. (until 2021), Tencent (since 2021) |
Turtle Rock Studios—known as Valve South between 2008 and 2010—is a United States-based video game developer established in March 2002 by Mike Booth. After being acquired by Valve in 2008, the studio was reformed in 2010 as a subsidiary of Slamfire Inc., led by Phil Robb and Chris Ashton. The company focuses on creating original games and offering consulting services throughout the digital entertainment sector.
Among its notable releases are the original Left 4 Dead (published by Valve), Evolve (initially planned under THQ but ultimately launched by 2K Games), and Back 4 Blood (published by Warner Bros. Games). Founder Mike Booth's background includes work at Westwood Pacific and involvement with the Counter-Strike franchise. Between 2011 and 2014, Turtle Rock grew from a six-person team to over seventy employees, concurrently establishing the subsidiary Turtle Rock Garage in 2011 to develop casual and experimental titles for platforms such as iPhone, Facebook, and Xbox Live. In December 2021, ownership transferred to Tencent.
Before Establishment
Michael Booth founded Turtle Rock Studios after collaborating with Phil Robb and Chris Ashton at Westwood Pacific, where they contributed to real-time strategy games like Command & Conquer: Red Alert 2. Ashton, who also had experience at Presto Studios, joined the Counter-Strike modding team as a texture artist, drawn by its success. When Seattle-based Valve, creators of Half-Life, acquired the mod, Ashton left Westwood to join Valve. Meanwhile, Robb and Booth remained at Westwood, working on titles such as Command & Conquer: Yuri's Revenge and Command & Conquer: Generals, but eventually departed following its acquisition by Electronic Arts, which Robb believed eroded the studio’s distinct identity.
Turtle Rock (2002–2007)
Established in 2002, Turtle Rock Studios began as a small group operating out of Booth’s garage—named after his local neighborhood. The team later moved into an office space and completed work on Condition Zero in 2004. Valve, impressed by their efforts, contracted Turtle Rock to develop the Xbox version of Counter-Strike, as well as Counter-Strike: Source and Half-Life 2: Deathmatch.
Pursuing a new project direction, Turtle Rock transitioned from competitive multiplayer toward cooperative gameplay, drawing inspiration from games like Secret of Mana. Their initial concept involved a first-person wizard combat game but was abandoned due to excessive complexity. Instead, they created a zombie-themed mod called Terror-Strike, built on Counter-Strike source code, featuring players battling knife-wielding zombie-like bots within a dark atmosphere.
Taking cues from the film 28 Days Later, the team expanded this idea into a full-fledged game focused on survival and evacuation amid a zombie outbreak. Valve provided financial support and publishing for the project. Development of Left 4 Dead commenced in 2005; it was publicly announced in November 2006 and released two years later for Microsoft Windows and Xbox 360 in November 2008. This release represented a pivotal moment for Turtle Rock’s expansion and influence within the gaming industry.
Valve South (2008–2010)
On January 10, 2008, Valve, under the leadership of founder and president Gabe Newell, acquired Turtle Rock to enhance its foothold in the console market prior to the launch of Left 4 Dead. This acquisition was viewed by Valve as a strategic alignment with their broader partnership objectives. After the purchase, Turtle Rock was rebranded as Valve South and operated as an internal satellite studio.
Following this change, between nine and eleven staff members relocated to Valve’s main office in Seattle. However, Valve concluded that the limited team size at Valve South restricted its capacity to operate as a triple-A development studio, while the physical distance between studios complicated collaboration. Turtle Rock voiced concerns over communication issues and project delays under Valve’s oversight. As a result, Newell opted to close Valve South after the release of Left 4 Dead, maintaining ownership of the franchise but permitting the original team to reclaim the Turtle Rock name and branding. This reorganization was publicly acknowledged by Valve executive Doug Lombardi in June 2009.
Turtle Rock (2010–2021)
Following the closure, founders Ashton and Robb revived Turtle Rock as an independent entity on March 17, 2010, announcing new projects and recruiting for a full-scale game development effort. Ashton and Robb co-led the studio, initially managing a team of roughly thirteen employees before expanding into a refurbished warehouse space.
Although no longer part of Valve, Turtle Rock continued collaborating by contributing to post-launch content for both Left 4 Dead and Left 4 Dead 2, as well as participating in early development stages of Counter-Strike: Global Offensive. In June 2010, Turtle Rock established Turtle Rock Garage, a subdivision dedicated to casual gaming projects. By September of that year, Digital Development Management began representing the studio to facilitate publishing agreements.
The company’s subsequent major undertaking drew inspiration from asymmetrical multiplayer elements in Left 4 Dead combined with hunting game mechanics, culminating in the development of Evolve. Initial proposals to publishers—including Valve—were declined due to doubts about the viability of asymmetrical multiplayer and concerns over Turtle Rock’s relatively small size. In May 2011, THQ committed to funding and publishing the title. However, THQ’s financial instability led to bankruptcy proceedings in December 2012 and an auction of its assets. Although Turtle Rock placed a bid of $250,000 for Evolve, Take-Two Interactive outbid them with an $11 million offer, securing publishing rights through its 2K Games label. During this period, Turtle Rock expanded its workforce to approximately seventy-five employees.
Originally planned for an October 2014 launch, Evolve was ultimately released globally on February 10, 2015, across PC, PlayStation 4, and Xbox One platforms. Despite favorable critical reception, player participation declined swiftly. The PC edition briefly transitioned to a free-to-play format before support was discontinued.
In December 2016, Turtle Rock announced it was developing a new intellectual property in partnership with Perfect World Entertainment and explored releasing games via Steam Early Access. This project was eventually cancelled following the dissolution of their collaboration.
Additionally, the studio ventured into virtual reality game development and partnered with Warner Bros. Interactive Entertainment on Back 4 Blood, regarded as a spiritual successor to Left 4 Dead. The game launched on October 12, 2021, targeting Windows PCs along with PlayStation 4 and 5, Xbox One, and Xbox Series X/S consoles.
As part of Tencent (2021–present)
In December 2021, Slamfire Inc., the parent company of Turtle Rock Studios, was acquired by Tencent for an undisclosed amount. Despite this change in ownership, the studio maintains its operational independence within Tencent's organizational framework.
Game portfolio
Turtle Rock Studios is widely recognized for its work on Valve's Counter-Strike and Left 4 Dead franchises. Notable titles developed include:
| Year | Title | Publisher | Win | Mac | Lin | Xbox | X360 | PS4 | PS5 | XBO | XS | iOS | Android | Oculus Go | Oculus Quest | Switch |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2003 | Counter-Strike (Xbox version) | Microsoft Game Studios | No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | |||||||||||||
| 2004 | Counter-Strike: Condition Zero | Sierra Entertainment | Yes | style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes | style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | |||||||||||||
| Counter-Strike: Source | Valve | Yes | style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes | style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | ||||||||||||||
| 2008 | Left 4 Dead | Valve | Yes | style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | |||||||||||||
| 2009 | Left 4 Dead 2: The Passing | Valve | Yes | style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes | style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | |||||||||||||
| 2010 | Left 4 Dead: The Sacrifice | Valve | Yes |style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No | style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |
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| Left 4 Dead 2: The Sacrifice | Valve |
style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |
style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |
style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |
style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |
style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |
style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |
style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no"|No |
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| 2010 | 'Leap Sheep!' |
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style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
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| 2015 | 'Evolve' | '2K Games' |
style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
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style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
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style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
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| 2016 | 'Evolve Stage 2' | '2K Games' |
style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes | |||||||||||||
| 'Face Your Fears' | 'Oculus Studios' | |||||||||||||||
| 'The Well' | 'Oculus Studios' | |||||||||||||||
| 'Face Your Fears 2' | 'Oculus Studios' | |||||||||||||||
| 'Journey of the Gods' | 'Oculus Studios' | |||||||||||||||
| 2021 | 'Back 4 Blood' | 'Warner Bros. Interactive Entertainment' |
style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
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style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"|Yes |
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Left 4 Dead
Left 4 Dead is a first-person shooter survival horror game launched in November 2008 for Microsoft Windows and Xbox 360. Developed by Valve with collaboration from Turtle Rock, it focuses on cooperative gameplay where players team up to combat zombie hordes and complete missions. The game includes a Versus mode featuring survivors battling special infected enemies such as the Smoker and Tank, with players swapping roles each round. Utilizing an enhanced iteration of the Source Engine, it incorporated Turtle Rock's second-generation AI system to improve bot behavior during gameplay.
Critics widely praised the title, awarding it an average score of 89/100 on Metacritic for the PC edition, and commended its innovation in cooperative gaming. Its commercial success led Valve to produce Left 4 Dead 2. By October 2012, the combined sales of both games reached twelve million units, underscoring their significant impact on the market and bolstering Valve's financial performance and industry standing.
Evolve
Following the success of Left 4 Dead, Turtle Rock developed Evolve as their next major title. Published by 2K Games and utilizing the CryEngine 3 engine, this asymmetrical multiplayer game pits four players in first-person perspective as hunters against a single player controlling a monster from a third-person viewpoint. An alpha version was made available on January 15, 2015, with the complete release arriving on February 10, 2015, for Microsoft Windows, PlayStation 4, and Xbox One. While the game was generally well-received by critics, the large amount of downloadable content at launch generated some controversy. By May 2015, Evolve had sold 2.5 million copies and was declared a "permanent IP" by Take-Two Interactive. The title shifted to a free-to-play format in July 2016, but its dedicated servers were ultimately discontinued on September 3, 2018.
Back 4 Blood
In March 2019, Turtle Rock revealed Back 4 Blood, a new original IP influenced by Valve's Left 4 Dead franchise. The game emphasizes cooperative play set against a zombie apocalypse backdrop and includes a player-versus-player component. Released on October 12, 2021, through Steam and Xbox Game Pass, it garnered generally favorable reviews from critics but received mixed reactions from the player community. Warner Bros. Interactive Entertainment published the game across multiple platforms including Windows, PlayStation 4, PlayStation 5, Xbox One, and Xbox Series X/S.