Heavy Unit/Hidden content
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Option
On the title screen, press HOLD ←+Ⅰ SELECT .
Sound test mode
On the title screen, press HOLD ←+Ⅰ+Ⅱ SELECT . To use the sound test, press ↑ and ↓ to select a sound, and Ⅰ to play the selected sound. To exit, press RUN .
Invincibility
On the option screen, set Game Level to "Hard" and Player to "3", then press Ⅰ x7 Ⅱ x12. This will make the ship invincible against enemy collisions and bullets, but not against terrain[1].
References
- ↑ @yamada_arthur on Twitter (Wayback Machine: 2022-02-14 12:46)
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