Unlock Concept Art
When you have collected the indicated amount of Artifacts the corresponding Concept Art will become an available option.
Unlock Sudan:
Collect 2 Artifacts.
Unlock Co-Op Levels (Wii Only):
Collect 8 Artifacts.
Unlock Allies:
Collect 12 Artifacts.
Unlock San Francisco:
Collect 14 Artifacts.
Unlock Panama:
Collect 18 Artifacts.
Unlock Extras:
Collect 20 Artifacts.
Unlock Enemies:
Collect 22 Artifacts.
Unlock Nepal:
Collect 26 Artifacts.
Unlock Istanbul:
Collect 28 Artifacts.
Unlock Odin And Seabed:
Collect 32 Artifacts.
Unlock Cutting Room Floor:
Collect 36 Artifacts.
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