Yes, you can play DS lite games on the DSi as well as the DSi XL
No. 3DS games are not compatible with the DSi XL.
there is a place called twiiter that has a lank at the bottom called DS Opera SDK. if you click on it there are 2 or 3 games that you can play on the dsi. I've tried it . the thing is you need to make an account though its completely free. twiiter name: Martiano13bros
No
There are only a tiny handful of 'DSi games', games which specifically need the DSi's camera to play. Most are even DSiware. So technically all DS game cards will work just fine on a DSi, there's no need to do anything to get them working.
The DSiware games are downloaded to your DSi and appear on its menu. You do not need to be connected to the internet to play those games.
yes
You can play ds games on the dsi and you can download games from the dsi shop channel using internet access.
No you need a flashplayer but you can get flash player on the dsi.
yes.
no you can't play dsi games in ds but you can play ds games in dsi.
take photos on different lenses, record music, play around with music, play games, go on the internet and play games!
The DSi can play DS and DSi games, as well as DSi ware games. It cannot play GameBoy games or 3DS games.
Nope. Sadly, you cannot because some of the games require a camera, the internet, etc. The DSi can play all Nintendo DS and DSL games, however.
Yes, you can play DS lite games on the DSi as well as the DSi XL
A US DSi can play UK games
Yes, they can play the dsi games.