If you complete the task then you will unlock the Zombie map shown.

Dead Ops Arcade - Successfully complete the Dead Ops Arcade game. Then use LT or RT to get out of the chair, then go to the terminal behind you. Type in "DOA" and play.

Der Riese - Requires a unique code that is included with the Call Of Duty - Black Ops Hardened and Prestige Edition.

Five - Successfully complete Campaign mode on any difficulty.

Kino Der Toten - Available at the start.

Nacht Der Untoten - Requires a unique code that is included with the Call Of Duty - Black Ops Hardened and Prestige Edition.

Shi No Numa - Requires a unique code that is included with the Call Of Duty - Black Ops Hardened and Prestige Edition.

Verruckt - Requires a unique code that is included with the Call Of Duty - Black Ops Hardened and Prestige Edition.

[thanks et knox or The Knox17]