Nintendo says Switch 2 backwards compatability was the "best direction" for players, even if it's still staying quiet on which games won't work

“As a result of that thinking, Nintendo Switch 2 plays Nintendo Switch 2 exclusive games, as well as both physical and digital Nintendo Switch games.

Certain Nintendo Switch games may not be supported on or fully compatible with Nintendo Switch 2.

The Nintendo Switch 2 will definitely be backwards compatible, but that confirmation did come with a bit of an asterisk, and the house of Mario won’t explain why yet.