Big heads - At the main menu, press R(2), L, R. If you entered the code correctly, a message will appear at the bottom of the screen.
Exploding bullets - At the main menu, press L, R, Z, Y, B. If you entered the code correctly, a message will appear at the bottom of the screen.
Exploding fists - At the main menu, press R(2), Y, B, X, R(2). If you entered the code correctly, a message will appear at the bottom of the screen.
Flame on - At the main menu, press X, Y, B, X, Y, B. If you entered the code correctly, a message will appear at the bottom of the screen.
Hero mode - Press L + Y with a full special meter.
Hot fists - At the main menu, press L(2), X, B, Y, L(2). If you entered the code correctly, a message will appear at the bottom of the screen.
Infinite Hero Time - At the main menu, press B, X, Y, Z, L, R. If you entered the code correctly, a message will appear at the bottom of the screen.
Invincibility - At the main menu, press L, R, L, R, L, R, L, R. If you entered the code correctly, a message will appear at the bottom of the screen.
Level select - At the main menu, press X, Y, Z(2), X, Y, Z(2). If you entered the code correctly, a message will appear at the bottom of the screen.
Liquid metal textures - At the main menu, press B, Y, X, B, Y, X. If you entered the code correctly, a message will appear at the bottom of the screen.
Pin heads - At the main menu, press B, X, Y, B, X, Y. If you entered the code correctly, a message will appear at the bottom of the screen.
Small heads - At the main menu, press L(2), R, L. If you entered the code correctly, a message will appear at the bottom of the screen.