All items:


Pause game play and press B(2), X(2), A,

Y, A, Y, Up, Left.



Invincibility:


Pause game play and press L, R, Up, X,

Right, A, Left, Y, Down, B,

A, Y, A, Y, R.



Three smartbombs:


Pause game play and press X(3), B(3), Y(3),

A(3), L, R.



Disable cheats:


Pause game play and press Up(2), Down(2), L,

R, L, R, B, A.



Level select:


Press Up, Right, Down, Left, X,

A, B, Y at the options menu.