The ladder on the stage comes down and ou can climb up it for safety and help.
maybe...
Are you talking about the tapes on Kino Der Toten on Black Ops? There are 3 tapes there. They can be found in the different rooms when you teleport back from the Pack-a-Punch room.
im pretty sure there is 2
you get a trophy
Nothing
They are so you put it in the camera thingy when you teleport and play the tape up on the big screen
you unlock more emblems
You get an achievement called NO-LIFE worth 9999999 gamerscore
You can't finish "Zombies" on "Call Of Duty Black Ops" .They are just endless waves of zombies until you die and start all over again.
you get banned
After you unlock all the guns from one class of guns like LMG's then you get a classified weapon.
The cassette tapes are the call of duty black ops equivilent of intel. To pick it up you just walk over to it and hold the reload button (x for xbox and triangle for ps3).