Der reise is not locked and is part of the rezurrection map pack purchased for $15 and downloaded from the PlayStation Store
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It unlocks the 3rd zombie mode. It is kinda stupid at first, but I'll get better
In Black Ops multiplayer you unlock the AK-47 at level 38.
You unlock gold camo in black ops, when you reach prestige level 14, level 25.
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For world at war you buy map pack 3 and on Black ops you buy the prestige or hardened edition of the game.