The early prototype games of "Left 4 Dead" have been exposed.

CTOnews.com, January 8 (Xinhua)-- some netizens have recently shared the early prototype games of "Left 4 Dead". Interested players can explore the early concept works of these popular shooting games. It is not clear where the prototype was leaked, but there have been many foreign media reports.

The prototype game is currently available for download on the GameBanana platform and is launched as a MOD form of "Counter-Strike: Source" called "Zombie City".

CTOnews.com learned from the official description that "Zombie City" is a map created by Valve (or possibly Turtle Rock Studios) as part of the map source folder released today.

This is probably the starting point for Left 4 Dead, and for those who have heard the name Terror-Strike before, you will be happy to have the opportunity to play this prototype level.

This prototype should come from the concept of Turtle Rock. Turtle Rock was involved in the development of "Counter-Strike: Condition Zero" and submitted two game ideas under development to Valve in 2005. The first is a wizard game that has never been implemented, and the other is a MOD called "Terror-Strike", a concept that involves hordes of enemies armed with knives.