At the title screen, enter the following combination:

Up dpad, Up dpad, Down dpad, Down dpad, Left dpad, Right dpad, Left dpad, Right dpad, B button, A button

Then to begin a one player game, press Start button, or to begin a two player game, press Select button, Start button.

At the title screen, press and hold the A button+B button buttons simultaneously and push Start button.

During the ending, before the closing credits starts rolling, press and hold Select button+Start button and keep on holding until the credits are over. If done correctly, you will receive a message from Red Falcon, vowing his revenge.