Can the Nintendo Switch play Nintendo Wii U games?
No, the Nintendo Switch can only play games for the Nintendo Switch because it does not have any backwards compatibility.
No. Nintendo DS games can be played on the Nintendo DS and the Nintendo DS only. Although, Nintendo GameCube games can be played on the Nintendo Wii. But you can't play Luigi's Mansion on the Wii it's spelled wii and i think you can. plus you can play animal crossing wild world character what you made on ds to animal crossing to the city ! I think its spelt wii aswell.
You cant play the DS on your Wii, but a lot of the games you can play on your DS, you can play on the Wii, like American idol, guitar hero, cooking mama, carnival games, and much more you can play on both. but however you cant play you actual ds on your wii. Also, many ds games are available as Wii Ware.