Some tips.

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.

GioCk

Zumbi Blocks

cherryskyy

Kravchic

Bot_Paco

Hydrasek

No Upgrade

Upgrade

Wave 5

Wave 10

Wave 20

Mode

Waves

Change in rules (No Gun)

NarvalooNG

NedherMan

OperaHwNK