Mr. Heli no Daibouken/Hidden content
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BGM select
On the title screen menu, press Ⅱ Ⅰ Ⅰ Ⅱ SELECT . To use the sound test, press ↑ and ↓ to select a song and Ⅰ to play the selected song. To exit, press RUN .
Extra credits
On the title screen menu, press Ⅰ Ⅱ Ⅱ Ⅰ SELECT . Press Ⅰ to add more credits, then press RUN to begin the game. Up to a maximum of 99 credits may be added, and going past that number will make the credit counter loop back to 1.
References
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