Parodius

All items:
Pause game play and press B(2), X(2), A, Y, A, Y, Up, Left.

Level select:
Press Up, Right, Down, Left, X, A, B, Y at the options menu.

Auto-pilot:
Pause game play and press Up(2), Down(2), LB, RB, LB, RB, B, A.

Control red octopus:
Wait until the penguins that located before the red octopus appear. Stop, then press Up + LB, B(5), Y(5), A(5). When the red octopus appears, press A + Y. The position and size of the red octopus may now be changed with the D-pad.

Invincibility:
Pause the game and press LB, RB, U, X, R, A, L, Y, D, B, A, Y, A, Y, RB.

Ship Power up:
Pause the game and press B, B, X, X, A, Y, A, Y, U, L.

3 Smart Bombs:
Pause the game and press X, X, X, B, B, B, Y, Y, Y, A, A, A, LB, RB.
Only works once per Level.

Disable Cheats & Auto Destruct:
Pause the game and press U, U, D, D, LB, RB, LB, RB, B, A.
Cheats will be disabled and ship will explode.