Valve leaks Left 4 Dead's early prototype in the latest CS 1.6 update
In a new update for Counter-Strike 1.6, Valve appears to have accidentally leaked one of the earliest prototypes of what would become Left 4 Dead.
Fans discovered that in the new update for CS 1.6, a mode called "Terror Strike" was included, most likely by mistake, which was essentially Turtle Rock Studios' prototype for what would later be L4D, complete with never-seen-before custom code.
As seen in @GabeFollower's X post, the mode is very basic, with players tasked with planting a bomb in typical Counter-Strike fashion, then killing all waves of "zombies," who are simply counter-terrorists armed with knives. Although it feels far from L4D and more like a community-created mode for CS, it's fascinating to see the starting point of what would become a beloved series.
The mode's map, "zombie_city," was discovered earlier this year and implemented into CS: Source by fans. It consists of only simple geometry and no textures, and it had to be ported to 1.6 by a user named "The One Epicplayer," who also added the zombie navigation mesh.
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