Gradius II: Gofer no Yabou/Hidden content

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Arcade mode

Hold ↑+Ⅰ+Ⅱ when booting the game from the CD-ROM² boot screen until the Konami logo animation starts playing. If done correctly, "AC. MODE" will appear by the Game Level setting in the Option menu. This will also rename the harder difficulties from "Hard" and "Professional" to "Difficult" and "Very Difficult".

All weapons

Pause the game and press ↑ ↑ ↓ ↓ ← → ← → Ⅱ Ⅰ (the Konami code). This can only be done once per stage unless the difficulty has been set to Easy.