Who knew owners of Call of Duty: Black Ops were getting three games in one package?

A pair of hidden games -- first uncovered by Kotaku -- is found on the menu screen of Activision's first-person shooter.

When players press start to access the menu, they'll find their character tied down to a chair in an interrogation chamber. Players can move the right thumbstick to control the camera.

To break their restraints, players quickly tap the left and right triggers alternately to escape. From there, they can explore the room.

To find the hidden games, turn left and walk around until you spot an old computer sitting on the right hand side, then hold X (or square for PS3) to use the computer.

Type "DOA" and unlock Dead Ops Arcade, a top-down, twin-stick shooter which offers a classic take on Black Ops' Zombie mode.

Also, players can type "ZORK" to unlock the text-based adventure title Zork I: The Great Underground Empire.

Readers, have you tried these games yet? What do you think?

By Brett Molina