No equipment mode:
Press Left(3), Right(3) at the event selection screen. The characters will start the event without any equipment.

Alternate costumes:
Hold Up or Down at the character selection screen, then press A or C to select that character.

Play as Jeff Jansens:
Complete the game in arcade or regular mode with at least 10,000 points. Highlight the "Regular" or "Arcade" mode options at the main menu. Hold L + R and press Start. Continue to hold L + R at the character selection screen, highlight B.B., and press A.

Play as Yellow Discman:
Select any character in any game mode. Then, press Up(2), B, Down(2), B when the loading screen with the event name appears.

Play as Black Discman:
Select any character in any game mode. Then, press Up(3), B, Down(3), B when the loading screen with the event name appears.

Play as Pink Discman:
Select any character in any game mode. Then, press Up(4), B, Down(4), B when the loading screen with the event name appears.

Running mode:
Press Left(3), Right(3) when the world records appear on an event's title screen.

Forward flip (Speed Ski):
Press Up, Down, Left, Right, A when your character appears on the Speed Ski event's introduction sequence.

Side flip (Speed Ski):
Press Right, Left, Down, Up when your character appears on the Speed Ski event's introduction sequence.

Alternate viewpoint (Slalom):
Hold A during the Slalom event's introduction sequence. Release A after the event begins.