Yes yes they do :/
Yes, DS games do work in a DSi XL. The DSi XL is part of the DS line, so DS games are meant to work with it.
No
You cant only on 3D DS and DSI and DSI XL and 3D DS XL
Yes, Nintendo DS games work on the XL.
All of the games that work for any DS will work for DSI XL.
Yes. All DS games work on all DS systems.
Yes and no.The games you are able to play in your DS XL can also be played in your 3DS, but they will not be in 3D. The 3DS games can only be played in your 3DS, and not in your DS XL (or any previous model) at all.
yes but 3ds games don't work on a ds lite
Yes they will. Plus there will be an advantage, bigger screen. Enjoy.
LEGO Battles can't be played on the Nintendo Wii. It can be played on the Nintendo DS, DS Lite, DSi, DSi XL, 3DS (without 3D), 3DS XL (without 3D), 2DS, New 3DS (without 3D), and New 3DS XL (without 3D)
Any ds games, including Health coach, can be played on a ds, dsi , or dsi XL and vise versa!I know because i had a ds, but I sold it to get the dsi XL. All the games work.
Nintendo DS and Nintendo DS Lite support Nintendo DS games and Game Boy Advance games. Nintendo DSi and XL only support Nintendo DS games.