The infected spawn on a floating platform with a CE pistol, while the humans spawn on the bridge. The bridge is cut up into a bunch of 16 by 16 by 2 block's. Under each block is an explosive barrel. When the infected shoot the barrel the block falls. The humans have to survive for three minutes while the infected blow up the bridge. Also there is a timed death barrier in the middle of the bridge because that peace does not fall. On the sides of the bridge are teleporters that will teleport you to the other side of the bridge.