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)
no you can't play dsi games in ds but you can play ds games in dsi.
Yes, original DS and DSi consoles are not region locked.
Nintendo DS games are region free, it doesn't matter where they come from, or where the console comes from, they are still compatable.
Yes, the DSi can play DS games
Yes, you can play DS lite games on the DSi as well as the DSi XL
they all play the same type dsi play ds games
There is no such thing as a DS lite game. There are just DS games, which are for all DS consoles.
Yes, DS games are not region-locked. Any console will play any games.
You can play 3DS, DSi or DS games. (Note: DS and DSi games do not display 3D visuals.
Yes, they can play the dsi games.
No Nintendo DS games work on Nintendo DS game consoles and maybe some other Nintendo and not on any of the Xbox or PlayStation game consoles regardless of the country or region.