You can unlock Fusion Mode by first beating the game on Normal. Choosing that completed file and copy it to another slot, then select New Game. Select "amiibo" at the difficulty choice and scan the Metroid amiibo.
Metroid: Samus Returns Review:
https://www.youtube.com/watch?v=peDKQ...
New Nintendo 3DS XL Samus Edition Unboxing:
https://www.youtube.com/watch?v=AakxV...
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Metroid: Samus Returns - First 5 Minutes of Fusion Mode ─ IGN
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