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==Development==
The concept of ''Left 4 Dead'' had its origins in a [[mod (video game)|modification]] created by [[Turtle Rock Studios]] for ''[[Counter-Strike: Condition Zero]]'', which they were co-developing with [[Valve Corporation|Valve]]. This mod, named "Terror Strike", saw four players assigned as the terrorists with the goal to plant a bomb and then defend it from unending waves of counter-terrorists. Turtle Rock also were co-developers of ''[[Counter-Strike: Source]]'', in which they refined the mod, refining the assets to make it more horror themed and having the players fight off zombies. Turtle Rock had attempted to get Valve to publish "Terror Strike" as its own game, but did not gain any traction until Valve writer [[Chet Faliszek]] discovered the project and championed it to Valve's CEO, [[Gabe Newell]].<ref name="kotaku terror strike">{{cite web | url = https://kotaku.com/pc-gaming-steam-valve-counter-strike-left-4-dead-l4d-1849966662 | title = A Fully Playable Left 4 Dead Prototype Has Been Discovered 15 Years Later | first = Sisi | last = Jiang | date = January 9, 2023 | accessdate = November 24, 2023 | work = [[Kotaku]] }}</ref> Both versions of "Terror Strike" for ''Condition Zero'' and ''Source'' eventually were released to the Internet in 2023.<ref>{{cite web | url = https://www.pcgamer.com/valve-accidentally-leaks-the-earliest-left4dead-prototype-and-it-was-a-counter-strike-mod-all-along/ | title = Valve 'accidentally' leaks the earliest Left4Dead prototype, and it was a Counter-Strike mod all along | first = Rick | last = Lane | date = November 24, 2023 | accessdate = November 24, 2023 | work = [[PC Gamer]] }}</ref>
With Valve's approval, development on ''Left 4 Dead'' started in mid-2005
To give ''Left 4 Dead'' significant exposure, Valve financed a $10-million marketing campaign for the game in the United States and Europe, with advertisements appearing on television, print, websites and outdoor placements in many cities. Valve also hosted photo contests called, "Dude, where's my thumb?" offering copies of ''Left 4 Dead'' to people who submitted the best picture involving zombies or the outdoor advertising.<ref>{{cite web |title=Left 4 Dead Available at Retail Worldwide |url=http://store.steampowered.com/news/2052/ |publisher=[[Valve Corporation|Valve]] |date=November 21, 2008 |access-date=November 25, 2008 |archive-date=October 10, 2012 |archive-url=https://web.archive.org/web/20121010053456/http://store.steampowered.com/news/2052/ |url-status=live }}</ref>
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