There is a secret old computer terminal in Black Ops that allows you to enter cheat codes to unlock the "Five" Zombie mode mission, Dead Ops Arcade game, Zork text-based adventure game, all missions, all Intel, and more.
The video on Black Ops 1 shows some separate rooms, assets, and other features which exist outside of the boundary of the game.
From DownSights: "Black Ops is not Black Ops without Nuketown. Following the tradition of releasing Nuketown for Black Ops games, the new Black Ops Cold War game also offers a revamped Nuketown called Nuketown '84.
Nuketown '84 has the same dimensions and map layout except for the aesthetics. The map's aesthetics have changed to fit the 80s theme, with destroyed buildings and graffiti-filled walls compared to a clean 50s suburban neighborhood seen in Black Ops 1."
Jacob writes: "What do we have with the original Call of Duty: Black Ops? Quite simply, one of the best Call of Duty titles of all time."
That was fast! but not unexpected :)
Geez, can people get the game home first?