Tyler McVicker is a Valve blogger in a new video posted to his YouTube channel Be informedAs part of a large-scale file leak of Counter-Strike: Source data, a prototype Left 4 Dead game from Turtle Rock Studios was made public.
Terror-Strike was a project that Turtle Rock Studios developed in the mid-2000s. Initially, the game was developed on Counter-Strike Condition Zero (GoldSrc engines), but later it was moved to Counter-Strike, Source (Source).
Terror-Strike saw a group of terrorists face off with endlessly regenerating counter-terrorists using knives. The users were not expected to kill their enemies, but to survive attacks by bots and to plant a bomb at Zombie City.
Only a few low-quality screenshots and comments by Turtle Rock founder Michael Booth have been available to testify to Terror-Strike. However, Wolfcl0ck has released Counter-Strike: Source mod which allows you to see the original origins for Left 4 Dead. Zombie City can be downloaded from the GameBanana Website.
McVicker says that Valve CEO Gabe Newell was approached by Chet Faliszek, a former studio writer, to suggest the idea of making Terror-Strike bigger. The leader accepted the idea, even though he initially didn’t want zombies in Left 4 Dead.
The Left 4 Dead prototype is not the only leaked Counter-Strike Source files. They also contain unfinished maps, modes, and ported levels from Condition Zero. For instance, Team Fortress 2 will feature a moving armoured car (bomb), territory control, and a bomb-resistant vehicle.