Alternate screen dimensions:
Press Right + Start + C at the character selection screen.

Alternate costume:
Press Down + A + B + C + D at the character selection screen.

Alternate CPU opponent costume:
Press Up/Right + Start + A at the character selection screen.

Alternate winning marks:
Press Left + Start at the character selection screen. Repeat the code to return to normal.

View song lyrics:
Hold Start and press A + D immediately before the "Round 1" message appears before fighting Arina.

Control Waku Ball:
Sweep the D-pad in circles at the character selection screen.

Waku Waku calendar:
Allow demonstration mode to start over seven times.

Alternate title screen:
Accumulate seven credits to reverse the title screen.