Wargames: Defcon 1

Triangle, o access all levels for W.O.P.R., go to two player W.O.P.R. Co-op. Highlight level two, then enter 0x0 0x0 xx0. Triangle, hen go to one player W.O.P.R. and all the W.O.P.R. stages are available.

Enter X, Square, X, Circle, Square, Square, Square, Circle, X as a password.

When your Stealth is about 5% hit the special weapons button over and over as fast as you can. It should make the percent go down fast and in to the negatives. Once it's in the negatives you can stop pushing the button.

Before the title screen appears, hold L2 and keep on pressing the START button.