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The Shooting Range

Minigun,Rifle,Chainsaw,Upgrader and Fridge right at the spawn,
All other existing Weapons can be acessed via Jumper

Diagonal Barricades which make Zombies remain on the same tile and not go from wall to wall, and also makes you always be able to get all the money.

At the top-row where the other Weapons are there are multiple doors next to each other which, if unlocked will let you drop into the zombie-pit so you can end the game accordingly.

You are completely safe from all zombies except the purpleheads.

Enjoy!