Well, I suggest you get some weapons first (Enfield, AA-12, FN Scar). A great method to kill more zombies is to start the game at the center of the map, because the zombie spawning is more concentrated there. Once there is no more zombies going to the middle of the map, you can go to the military base that we may refer to the north of the map. You don't go south. Never. You can kill mostly of its zombies with the Enfield, and you can easily come back to the middle from the north. You need to kill exactly 12 zombies to get to Wave 2. To Wave 3, it's 28. Wave 4, it's 45 kills And finally, Wave 5 it's around 62 to 65 kills.