Rabio Lepus Special (TurboGrafx)
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Blue mode
Hold Select and press I four times, II four times, I four times, II four times.
Expert mode
Hold Select and press I, I, II, II.
Green mode
Hold Select and press I three times, II three times, I four times, II four times.
Shield 4 more
Hold Select and press I four times, II three times, I, I, 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.
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.
Usagi 5 mode
Hold Select and press I five times, II, I five times, II, I five times, II.
Yellow mode
Hold Select and press I three times, II three times, I three times, II four times.