In order to get complete the gallery option, you must collect all eight images, each in every stage.
At the main screen, press Right, Up, Left, A, Right, Select.
Successfully complete the game to unlock the 'Level Select' selection at the options screen.
Powerful close-range shots
At the main screen, press Up, Down, Left, Right, B.
Unlimited chest plate blasts
At the main screen, press B, A, Left, Down, Up, Right.
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