Infection on Valhalla's snow
Play infection in custm games on narrows... First go to the waterfall then you will see stacked boxes jump over them to find a teleporter. Go into it. It will teleport you straight to Valhalla's snow part. When you are the last man standing the zombies will come and try to get you but they die in one shot or so, so stay there and keep fending them off...
More tricks, tips and cheats for this game are right here - Halo 3 cheats
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