Yes, the original DS and the DS lite are 100% compatible with games. The only difference between the two is they both need different battery chargers.
Yes you can there is no such thing as a DS lite game they are all just DS games.
yes you can
If you are asking if ds lite games will work in a sp the the answer is no.
yes, ofcoarse you can
You cannot download games to your DS lite.
Yes, you can use ds lite games in the original Nintendo ds. They are not making new specialized games for the Nintendo ds lite. they are still making games that fit both the original DS and the Nintendo DS Lite.
You canNOT download games on your Ds Lite, Sorry :*(
Yes, DS games are region free.
Yes, the NDS lite can play all DS games
You just put them into the GBA, original DS or DS lite.
Yes, you can play Gameboy Advance games on the Nintendo DS Lite, since the DS Lite is just an updated version of the Oringinal Nintendo DS which it can play Gameboy Advance Games.
Yes you can play Nintendo DS games on a Nintendo ds lite.