No. DSI skins are small and could get stuck in side the 3DS. So DONT'T DO IT!!!!! :)
No they do not i have tried
No, 3DS games will only work in a 3DS.
It will fit, but it will not work on the Nintendo 3DS
No, a DSi is not powerful enough to run a 3DS game, and 3DS cartridges are specially shaped so they will not fit into anything but a 3DS.
No, you cannot play 3DS games on a NDSi or NDS
If they were specially designed for the 3DS, no. There is a small tab jutting out of the side of 3DS games making them unplayable on a DSi. Even if you could fit the cards into a DSi, they would not work because they use 3D technology the DSi cannot utilize. DSi games will be playable on the 3DS though.
No, because the 3DS games have a special shape that can't fit in the DS or DSi
There is no such thing as a 3DS DSi.
There is no DSI 3DS comming out, the 3DS has DSI features and the 3DS is the new version of the DSi but, remember the 3DS is 3D, Seeing is believing.
Yes, the 3DS has backwards compatibility to DS and DSi games.
It won't fit in a DS or a DSi, there is a tab on the 3DS game to stop it.
The 3DS transfer tool allows you to transfer DSI games from a DSi to a 3DS.