Full power-up:
Pause game play and press Up(2), Down(2), Left, Right, Left, Right, B, A, Start for missiles, items, and shields. Note: This may only be done once per level.

Continue game play:
Quickly press Down, Up, B, A, B, A, B, A, B, A after losing the last ship on level two or higher.

Level skip:
Destroy the ship that appears at the end of each level within five seconds to skip the next level.

Sound test:
Hold A + B and press Start at the title screen.

Hidden message:
Hold A + B then turn on the NES. The message "KONAMI ONE GRADIUS TEN" will be displayed.

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