Rabio Lepus Special

Rabio Lepus Special
Developer: Minakuchi Engineering Publisher: Video System Platform: TurboGrafx-16 Released in JP: October 19, 1990 This game has a hidden sound test. This game has a hidden level select.

Sound Test

At the title screen, hold Select and press I four times, II once, I two times, and II six times.

Level Select

At the title screen, hold Select and press I 37 times, II three times, I four times, II three times, and I two times. I and II will change the level number, but remember to keep holding Select or the prompt will go away.

(Source: GameFAQs (Mezmorize99))