Take a look at one of Left 4 Dead's earliest prototypes thanks to a Counter-Strike: CZ update mistake

Wuh-oh, for some reason, an "extremely early" Left 4 Dead prototype has been found thanks to a recent Counter-Strike: CZ update. Video games are weird little things - sometimes a dev will build something in a game that ends up unused, and it just has to get locked away as removing it could risk breaking everything else. That sometimes leads to fun little discoveries, and as shared by PCGamer, in Counter-Strike: CZ's recent 1.6 update, a Left 4 Dead prototype titled "Terror Strike" was discovered...