A lot of ammo.
Ok when your on top of the apartments get the pump shotgun or the mini machine gun and a health pack.Next jump off the building it will kill you.When your back on top the apartments your gun should have more ammo than it did before.Keep doing this and you will be preppared for anything.
P.s.The guns will get stronger and the zombies will get a little stronger too.
More tricks, tips and cheats for this game are right here - Left 4 Dead cheats
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