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THIS JUST IN! Hackers interdpth and PJBoy have recently created a hack that unlocks Fusion's embedded debug mode! The hack allows you turn on/off any of Samus's weapons at any time, as well as other things like giving access to doors and other events. This debug mode was left in the game's code, and all the hackers did was turn access to it back on. Check out the video below. Download it here. You can find more information for its use via our FanApps page. Happy debugging!
NOTE: Use at your own risk. The Metroid Database will never provide ROM files to the public.
UPDATE: We now have a rough translation of the event text so you can figure out what events you can unlock.