Unlock Chimaira: Mission 29: Kill one zombie by the chimaira sign.
Unlock Slipknot 0: Mission 5: Kill one zombie by the slipknot sign.
Unlock Slipknot 1: Mission 7: Kill one zombie by the slipknot sign.
Unlock Slipknot 2: Mission 10: Kill one zombie by the slipknot sign.
Unlock Slipknot 3: Mission 13: Kill one zombie by the slipknot sign.
Unlock Slipknot 4: Mission 16: Kill one zombie by the slipknot sign.
Unlock Slipknot 5: Mission 20: Kill one zombie by the slipknot sign.
Unlock Slipknot 6: Mission 23: Kill one zombie by the slipknot sign.
Unlock Slipknot 7: Mission 26: Kill one zombie by the slipknot sign.
Unlock Slipknot 8: Mission 31: Kill one zombie by the slipknot sign.
Unlock Santa Claus or Bloodrayne
The will be unlocked after finish all missions.
Unlock Bloodrayne, Alternate method
Get a gold medal on mission 33.
Easy combos
When you get the chainsaw, combos will become easier. Stand over a Manhole, let the chainsaw rip, and watch your combos go over the top. Ones with lots of enemies around them are recommended, as you can get up to a Ten combo with one slice.
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