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The Challenge Experience

Get at least a bronze medal on all single player challenges.

The Challenge Experience+0.3
1 guideOffline Game ModeSingle PlayerTime/Date
Dracul RosuDracul RosuThis gamer has had their achievements removed from the site
16 Oct 2011
0 0 0
There are 30 challenges in total scattered around the complex marked by purple stars, only one is unlocked at the begining, the others will unlock as soon as you kill the required nomber of zombies.

Bronze is a piece of cake, and even gold is kinda easy, you just need to know the right combinations of weapons/outfits/magazines to use

Here is a topic with hints