At the title screen, enter the code Up, Up, Down, Down, Left, Right, Left, Right, A, B, C (A modified Konami Code), you'll enter a sound test for the game's various sound effects. Press left and right on the D-Pad to cycle through sounds.
Sega 32X Item
If you play Pier Solar with a Sega 32X attached, there's somebody in Bethina's hideout who notices. He'll give you a special accessory, Sonic's Shoes.
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Have We Been Fooled?
You can submit a problem report for any non-working or fake code in the lists above.