Invincibility: Pause the game and Press: UP, Y, LEFT, A, DOWN, B, RIGHT, and C. Then Unpause.
Replenish life Pause game and press: DOWN, R, UP, L, X, A, Y, B, Z, C, RIGHT, and LEFT. Then Unpause.
Sudden Death: Pause game and press: L, A, R, C, B
99 Lives: Highlight the ''Lives'' option and press Right; you will find that instead of being limited to just five lives you can start the game with as many as 99: In the Option menu press LEFT, RIGHT, LEFT, RIGHT, UP, DOWN, L BUTTON, R BUTTON, START on Controller 2.
Level Select: Enter 99 Lives code. Return to title screen, press UP, DOWN, LEFT, RIGHT, L BUTTON, R BUTTON, A, Y, C, Z, B, X on Controller 1
Pause game and press: DOWN, R, UP, L, X, A, Y, B, Z, C, RIGHT, and LEFT. Then Unpause.