Go to the option menu when at the title screen. Using the sound test play 01,09,09,02,01,01,02,04 in that order to activate Debug Mode. If you entered it correctly you'll here a ring chime. Then depending on your controller, press Start or + to go back to the title screen. On the Wii remote press A + Start or on the Gamecube controller press B + Start to start the game using debug mode otherwise it will start without it activated.