Can I play Nintendo 3ds games on dsi xl or dsi?
None, the 3DS games cant be played on an older system, but I think older games can be played on a 3DS.... (correct me if I'm wrong)
You can play Nintendo 3DS games on DSi. They will work just fine. You can go to http://ds.about.com/od/nintendods101/tp/Should-You-Buy-The-Nintendo-3ds-Or-The-Nintendo-Dsi.htm for more information.