Yes, DS games are region free.
Yes but you'll need an AcKard or R4 to play them on
there is only 2 free games
Yes you can when you get Internet on your DSi go to the store on your DSi and you get 1000 DSi points for free.
Go to Nintendo DSi Shop. There will be games where you have to trade in DSi Points for the game and there are some that are free. Just click on the free game and click download.
Yes, they can play the dsi games.
yes yes you can
Yes, the DSi can connect to the DSi store, from which games can be bought and downloaded.
Yes, you can play DS lite games on the DSi as well as the DSi XL
yes you can
Yes, the DSi can play DS games
Yes and I have all the games and I play it with the Dsi