Wow this game has improved a lot i look forward to playing it more often, haha when you get through every room with the best weapon just buying ammo for it and killing zombies, you know nothing can stop you.
Mp5>Scorpion, Shotguns.
I have learned from pros that the Mp5 can over power any gun from the weakest pistol to the beneli. So one you reach that certain level save up your money for mp5. Trust me, you won't regret it. + up if this helped!
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