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Dirty work

Defeat the first boss in Story mode

Dirty work0
1 guideOffline Game ModeSingle PlayerMain Storyline
18 Oct 2012
3 2 0
This is given for beating the first boss in Story Mode. This the big fat green guy that comes out of the ground. There are machine gun and health power ups around that keep respawning.

If you begin to get low on health, get out of his range and wait for the health powerup to re-appear. Also take out all the zombies around him first as to make it much easier.