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Go to the computer in the main menu and type in 3ARC UNLOCK to get "Five" and "Dead Ops Arcade" you have to buy prestige or hardened maps to unlock even more maps.
you cannot unlock them you have to buy them on PSN or LIVE Marketplace
By hacking.
the only map you can unlock is the captain falcon map by playing at least 50 times
3arc unlock no that it the code for dead Ops and five only