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0000kill the zombies coming from there until you get the grenades, then blockade the top part of it like this
00000000then just chuck the grenades over the blockade and get your high score[/spoiler]
www.dosgames.com C-Dogz is somewhere in there, great fun in multiplayer.
HINT: Keep Moving, They Can`t touch you if you never stop mving, you can just plow threw them. The Uzi Works best For that, You obtain unlimited Ammo ands Rapid fire at one point, I did not try the railgun, but looks fun.