Metroid 2 on 3DS has content locked behind Amiibos

https://www.vg247.com/2017/07/31/metroid-samus-returns-amiibo-exclusive-content-includes-hard-mode-and-other-goodies-costs-as-much-as-the-game/

Basically Nintendo is telling people they should download a rom instead by doing this otherwise you're a sucker for buying their 25 year old game that has "on disk" DLC that you have to go to the store to buy added to it.