This strategy is for four players.

To start off stay in the first room for 4 to 5 rounds. After that have two people buy mp40 and two people buy stakeout. Stay another two rounds in that room.

After that locate the mystery box and buy a gun from it. After that turn on the power, then from there just kill zombies.

Please note that all four of you should stay together or split up in groups of two.

Always buy juggernog before you buy quick revive and all that other stuff.