Question: Which "30 Under 30" influential figures in the video game industry worked on  a cooperative first-person shooter video game with survival horror elements?

<P0-S0>  The game uses Valve's proprietary Source engine, and is available for Microsoft Windows, Xbox 360 and OS X. <P0-S1>  Development on the game was completed on November 13, 2008, and two versions were released digitally: A downloadable digital version, released on November 17, 2008, and a digital retail disc version, with a release date determined by region. <P0-S2>  The digital retail disc version was released in North America and Australia on November 18, 2008; and in Europe on November 21, 2008. <P0-S3> Left 4 Dead is a cooperative first-person shooter video game with survival horror elements, developed by Valve South and published by Valve Corporation. <SEP> <P1-S0> Kim Swift (born 1983) is an American video game designer best known for her work at Valve with games such as "Portal" and "Left 4 Dead". <P1-S1>  Swift was featured by Fortune as one of "30 Under 30" influential figures in the video game industry. <P1-S2>  She was described in Mental Floss as one of the most recognized women in the industry and by WIRED as "an artist that will push the medium forward". <SEP> <P2-S0> S.T.A.L.K.E.R.: Shadow of Chernobyl is a first-person shooter survival horror video game developed by GSC Game World and published by THQ. <P2-S1>  The game is set in an alternative reality, where a second nuclear disaster occurs at the Chernobyl Nuclear Power Plant Exclusion Zone in the near future and causes strange changes in the area around it. <P2-S2>  The game has a non-linear storyline and features gameplay elements such as trading and two-way communication with NPCs. <P2-S3>  The game includes role-playing and first person shooter elements. <P2-S4>  In "S.T.A.L.K.E.R", the player assumes the identity of an amnesiac "Stalker", an illegal explorer/artifact scavenger in "The Zone", dubbed "The Marked One". <P2-S5>  "The Zone" is the location of an alternate reality version of the Zone of alienation surrounding the Chernobyl Power Plant after a second fictitious meltdown, which further contaminated the surrounding area with radiation, and caused strange otherworldly changes in local fauna, flora, and the laws of physics. <P2-S6>  "Stalker" in the context of the video game refers to the older meaning of the word as a tracker and hunter of game or guide. <SEP> <P3-S0> The video game industry in the Czech Republic has produced numerous globally successful video games such as and the subsequent ArmA series, the Mafia series, Truck Simulator series, the Samorost series and others. <P3-S1>  There were 300–400 video game developers and around 30 video game companies focusing on video game development in 2014. <P3-S2>  In 2017 it was 1,100 developers and 47 companies. <P3-S3>  Video games are also considered by some experts to be the country's biggest cultural export. <P3-S4>  The video game industry did not enjoy a good reputation and was unsupported by the state until 2013, when the Ministry of Industry and Trade started to seek ways to kickstart the economy. <P3-S5>  By 2014, programs were planned to support the video game industry. <P3-S6>  Another problem is a lack of video game development specialization at any university.