no you can't play dsi games in ds but you can play ds games in dsi.
Yes Nintendo ds games work on DS, DS Lite and DSI. The DSI does not support gameboy advance games but the DS does.
A DSi uses DS games.
Yes, the DSi can play DS games
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, the DS and DSi games will not be in 3D.
a real game yes a fake one no
No, you do not. The DSi is simply an advanced version of the DS lite. You can play your DS games and only your DS games on the DSi, minus the fact that you can download games from the DSi store.
yes you can use Nintendo ds games in a dsi
ds games are dsi games
The DS and DS Lite will play DS and GameBoy Advance games The DSi will only play DS games (and downloadable games from the DSi shop)
You can download unlimited, full version Nintendo DS and DSi games and easily transfer them to your DS / DSi using: http://www.squidoo.com/Download-DS-Games