Easy guide for ClownZ farming and passing levels!
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1. Choose map!
2. Go to shown place! ( Run up the stairs, Go in corner and carefully jump over the railings)
3. Wait for Zombies to come
4. Shoot them till the round ends.
5. Done!
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Autor note: If ammo runs out then just jump to ground but away from zombies and restock whilst running them around.
I usually had to do it twice by the round 20. You can use RPG, which is useful but it glitches out sometimes and shots wont do anything.