Hey, man. no flash cart can play 3ds games on 3DS, and no flash cart can play 3DS games on DSi. if you want to buy a r4 card work with the 3DS XL, just play DS games. there are a few of them can do it. the best one is r4i gold 3ds card. this one: R4i Gold 3DS Wood R4i 3DS flashcard For DS DSi 3DS -dsflashcart.com And 3DS XL new firmware has been updated to V4.5.0-10. currently only r4i gold 3ds and supercard dstwo can work on it, so if you want to buy r4 card, just buy the r4i gold 3ds.