At the main menu: press your special and primary grenade buttons (for PS3 this would be L2 and R2). Mason will get up from the chair. Then walk over to the computer and access it. Type in DOA. It will open the Dead Ops Arcade minigame. You can also type in ZORK to get the Zork minigame.
3arc unlock
You go to Combat Training.
you buy the maps
You buy it with COD points
You buy the Prestige or hardened edition of Call of Duty Black Ops.
You cannot unlock it, only in Black Ops.
At level ten you unlock the playercard
You don't unlock it you just buy it when you have enough COD points.
Level 27, for 2000 cod points
You have to be Mod. I would rather not do it.
MW3 is after COD black ops.
Unlock By Leveling Up, And Purchasing With COD Points