From the Options screen, press A, Down, B, Down, C, Down, A, B, Up, A, C, Up, B, C, Up. To activate, hold A and press Start for level 2, hold B and press Start for level 3, or hold C and press Start for level 4.

Note: These codes represent the original SEGA Genesis controller button layout. Your Wii Virtual Console input device will reflect different button names.