Ring the mysterious bell. What happens after that, is up to you.

Create weapons to rival the gods of fire or thunder.

Kill 250 zombies using blunt melee weapons.

Reach level 10.

Create a customized weapon.

Kill a zombie with 10 different melee weapons.

Complete the third mission of the U.S.S. campaign.

Kill an infected teammate with a headshot before they become a zombie in any mode.

Witness the beginning of the Raccoon City outbreak.

Complete chapter 3 in the Single Player Campaign

Complete chapter 1 in the Single Player Campaign

Reach Wave 15 in each mission of Special Ops Survival mode.

Kill 30 enemies with the XM25 in "Black Tuesday."