Sound test
Hold L + R and press Start when the text "Press Start" begins flashing at the title screen.
Level select
Hold X + Y, then press A(4), B(4), A, B, A, B, A, B, A, B when the text "Press Start" begins flashing at the title screen. Enter this code again on the level selection screen to select a specific stage within that level.
Alternatively, hold X + Y and press A, B, A(4), B(4), A, B, A, B, A, B, A, B at the title screen.
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