For the Xbox you extract your COD:WaW gamesave using a transfer kit and then either use a hex editor or Modio or the COD Tool to place dvars into your gamesave to make the game go 10X the speed, give you 'triple' tap instead of double tap, higher jump height, instant reload etc etc. If you set game speed to the highest and place the dvar ai_spawn 0 or something similar to that in your profile, no zombies spawn and the rounds just fly through