Rainbow Six

Supermen mode:
Pause game play, then hold L1 and press X, Square, Triangle(2), Circle, Square, X(2).


Free-for-all mode:
Pause game play, then hold L1 and press Circle, Triangle(2), X, Circle, Square, X, Triangle.

No terrorists:
Pause game play, then hold L1 and press Triangle, Circle(2), Triangle, Square, X, Triangle, Circle.

Note: This may also be done at the main menu. (Information from Cheat Machine)