You can play Nintendo DS and DSi games on the 3ds, but the 3ds doesn't have a slot on the bottom for Gameboy games.
You'd have to use system transfer to migrate your ID from the 3DS to the 3DS XL before you can access your downloaded games on it.
No, you can play regular DS games on a 3DS too.
any ds or 3ds game can be played on any 3ds system.
3DS games are region locked, a 'French' one (actually an EU one) will work on any European 3DS, and also the Australian one.
yes
You buy ds or 3ds games and then put them in your 3ds.
Yes, you can. However, since the Nintendo 3DS are region locked, the European 3DS will not be able to play North American 3DS games.
3DS games do not have friend codes, it is the friend code of the 3DS itself that you use, to be able to play multiplayer on a 3DS game.
No, 3DS games can only be played on the 3DS.
yes
Yes, it does. There are Nintendo 3DS games that are exclusively for the 3DS family.
There could be a few factors that causes this to happen: - The 3DS needs to have the wireless slider turned on - The NDS cannot play 3DS games so it will not connect if the 3DS is playing 3D games - Some games require both consoles to have the gamecard in order to link. (cannot use DS Download Play)