Spiral Wave/Hidden content

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Hidden options

On the title screen, press Ⅰ Ⅱ Ⅰ Ⅱ  RUN  to display a hidden options menu with a sound test. Other options are available, however they are locked out and require alternative codes to be entered on the title screen:

Shooting stage select

On the title screen, press ↑ ↑ ↓ ↓ ← → ← → Ⅱ Ⅰ Ⅱ Ⅰ  RUN . This will enable the "SHOOTING" option, which acts as a shooting stage select. Select a stage with ← and →, then press Ⅰ.

My ship

On the title screen, press Ⅰ Ⅱ ↑ ↓ ← → Ⅰ  RUN . This will enable the "MY SHIP" option.

Undead mode

On the title screen, press ↑ ← ↓ → Ⅱ Ⅰ Ⅰ Ⅰ  RUN . This will enable the "UNDEAD" option, which toggles invincibility.

Hidden text

Located at ROM address 62:

1991/10/04 Created By Masaharu. Tsuchikura.