Nintendo Switch 2 may not support 'certain Switch games'
Briefly

Nintendo has indicated that while the Switch 2 will support both physical and digital Switch games, compatibility for certain titles is uncertain, with details forthcoming.
The confirmation that the Switch 2 is set to lose the IR motion camera in its Joy-Cons raises concerns, particularly for games that heavily rely on this feature.
Observations from the reveal trailer suggest that the Switch 2 Joy-Cons will feature an optical sensor instead of the traditional IR camera, marking a significant design shift.
The possible absence of an NFC reader for amiibo figures raises questions, though leaking information hints at its inclusion in the new console.
Read at Polygon
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