|This page is rather stubbly and could use some expansion.|
Are you a bad enough dude to
Hold A and press Reset. The purpose of this mode is unknown.
Hold B and press Reset. The game will perform the complete ROM/RAM tests and display the results. Also, it will perform printer test with output to the printer itself.
Touch Panel Test
Hold B + Select and press Reset. Now you can test the regular controllers, plus the additional touch-screen controller if you're lucky enough to have one.
Hold Right + Select + Start and press Reset. The purpose of this mode is unknown.