well those three are easy if you use the 'strategy' i use (got it off youtube) ….. see what you do isssss
-knife the zombies on the first two rounds
-then open up stairs/gate (your choice)
-get a weapon (try to get either the wunderwaffle or a MG)
-after the dogs come open up comm room
-then jus run around the swamp like 5-6 times
-DONT shoot zombies when your trying to get the big pile of them behind you.
only shoot them if you HAVE to
-(there should be a big group of zombies behind you)
-then turn around and shoot the crap out of them!!!!
lol SORRY IF THAT SOUNDS CONFUSIN