Six credits:
Hold Select and press I, II, II, I three times, II four times. The word "CREDIT6" will blink above the title to confirm correct code entry.
Expert mode:
Hold Select and press I, I, II, II.
Yellow mode:
Hold Select and press I three times, II three times, I three times, II four times.
Blue mode:
Hold Select and press I four times, II four times, I four times, II four times.
Green mode:
Hold Select and press I three times, II three times, I four times, II four times.
Usagi 5 mode:
Hold Select and press I five times, II, I five times, II, I five times, II.
Shield 5 mode:
Hold Select and press I nine times, II eight times, I seven times, II six times, I five times, II four times, I three times, II, II, I.
Shield 4 mode:
Hold Select and press I four times, II three times, I, I, II.
