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Big Head Mode
To turn on Big Head Mode, go to the main menu and press R, R, L, R.
Exploding Bullets
Press L, R, Z, Y, B on the main menu to make your enemies go, "BOOOOOOOM!" with any shot.
Exploding Fists
To learn the art of full body explosion, press R, R, Y, B, X, R, R on the main menu.
Flame On
To turn on Flame On, press X, Y, B, X, Y, B on the main menu.
Hot Fists
To turn up the heat, press L, L, X, B, Y, L, L on the main menu.
Infinite Hero Time
To move like there's no better tommorrow, press B, X, Y, Z, L, R on the main menu.
Invincibility
For Invincibility, press L, R, L, R, L, R, L, R, L on the main menu.
Liquid Metal Mode
To get Liquid Metal Mode, go to the main menu and press B, Y, X, B, Y, X.
Pin Heads
To use Pin Heads, press B, X, Y, B, X, Y on the main menu.
Small Heads
To use Pin Heads, press L, L, R, L on the main menu.
Unlock All Levels
To skip the bullstuff and go into any stage, press X, Y, Z, Z, X, Y, Z, Z on the main menu.