Unlock Samus without her suit:
Finish the game with a time under 6:30 and all items (100%) to see Samus Aran without the suit, wearing something similar to a bathing suit.
Or finish the game in under 2:00 with at least 50% of the items.
Delete saved data:
When turning on your Game Boy Advance hold L + R. Keep the buttons held until the message "Do you want to erase all saved memory?" appears. Move the missile over to "Yes" and press A.
In-game reset:
Press Select + Start + A + B while playing the game to return to the main screen.
Samus without her helmet:
Finish the game with a time less than three and a half hours and at least 48% of the items collected.
How to beat Ridley:
While walking into the arena, charge up your beam and shoot it at Ridley. Perform this action for about seven to ten times. Ridley should get red quickly.
Invincibility:
Charge up Charge Beam (if available), and do a Spin Jump.
Gallery mode for the Japanese version:
Finish the game to unlock the Gallery Mode option.
Hard difficulty setting for the Japanese version:
Finish the game under normal difficulty to unlock the Hard Mode option.
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