1943 Kai/Hidden content

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Infinite ammo

Pause during gameplay and press → ← Ⅱ Ⅰ ↑ ↓ Ⅰ Ⅱ ↑ ↓ ↑ ↓. A sound will confirm correct entry, and primary weapon upgrades will not run out over time.

Infinite lightning attacks

Pause during gameplay and press → Ⅰ Ⅱ ← Ⅰ Ⅱ ↑ Ⅰ Ⅱ ↓ Ⅰ Ⅱ  SELECT  ↑ ↓. A sound will confirm correct entry, and lightning attacks can now be used without draining the energy bar.

Infinite somersaults

Pause during gameplay and press ↑ ↑ ↓ ↓ → → ← ← Ⅱ. A sound will confirm correct entry, and the somersault maneuver can now be performed an unlimited number of times.

Invincible helpers

Pause during gameplay and press ↑ → ↓ ← ↓ → ↑ ← Ⅰ Ⅰ Ⅱ Ⅱ  SELECT . A sound will confirm correct entry.

Weapon select

Pause during gameplay and press ↓ Ⅱ ← Ⅱ ↑ Ⅰ → Ⅰ. A sound will confirm correct entry, and primary weapons can now be changed by pressing  SELECT .

Sound test cheats

Original mode

Play songs 07, 07, 07, 07, 09, 03, 10 in the sound test. A sound will confirm correct entry, and a setting to toggle between "Arcade" and "Original" mode will be available.

Original mode + max HP

Play songs 03, 07, 03, 05, 01, 08, 02, 01, 09, 08, 04 in the sound test. A sound will confirm correct entry, and a setting to start with a maximum energy bar as well as the above setting will be available.

Fast mode

Play songs 01, 06, 00, 10, 05, 02, 10, 03, 08 in the sound test. A sound will confirm correct entry, and the game will run at double speed.

9 credits

Play songs 00, 03, 03, 08, 03, 09, 00, 00, 08, 00 in the sound test. A sound will confirm correct entry, and the credit setting can be set up to 9.

Infinite credits

Play songs 03, 04, 03, 08, 00, 01, 04, 01, 14, 14 in the sound test. A sound will confirm correct entry, and the credit setting can be set to infinite (marked by an explosion icon).