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November 22, 2013
All credits to Nexon, Valve and TianCity.
Zombie Shelter: Coop is the heavily modified version of the original Zombie Shelter. Unlike the previous mode, the players have to coop building the same shelter and defeat the incoming bosses. The players will win after defeating the Fallen Titan.
There are many new features updated to this mode. Some of them are C4s, electric and watch towers.
Counter-Strike Online - Zombie Shelter Coop - China Trailer