Metroid: Samus Returns has a standard hard mode that can be unlocked after beating the game
Much has been made about amiibo functionality in Metroid: Samus Returns. More specifically, some fans have been upset that the game’s Fusion mode, which unlocks a harder difficulty and the ability to wear Samus’ suit from Metroid Fusion, is locked behind amiibo. There is good news, however.
Fusion mode can indeed only be unlocked with the new Metroid amiibo. Nintendo also has no plans to sell it separately on the eShop.
That being said, Nintendo has confirmed that Metroid: Samus Returns has a standard hard mode that will can be unlocked once players complete the game on regular difficulty. It’s separate from Fusion mode’s own harder difficulty, and isn’t tied to any amiibo.