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Developer: Sting Publishers: Data East (Original), G-mode (Wii Virtual Console) Platform: TurboGrafx-16 Released in JP: January 8, 1991 This game has a hidden sound test. This game has a hidden level select.

Sound Test

Press Reset 10 times, then hold Select and press Run at the title screen.

(Source: GameFAQs (real_mukimuki))

Level Select

At the title screen, hold Run and press Select 10 times. When the title screen reappears, hold one of the combinations of buttons in the table below, then press Run to go to the corresponding level.

Level	Button Combination
2	Up+Select
3	Right+Select
4	Down+Select
5	Left+Select
6	Up+Right+Select