Yes, the NDS lite can play all DS games
Yes, you can play DS lite games on the DSi as well as the DSi XL
It can play GameBoy games and DS games.
No. There is no way to download or play DSiWare games on Nintendo DS or DS Lite systems.
Yes, the original Nintendo DS as well as the Nintendo DS lite can play NDSi games.
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, the NDS lite can play all DS games
No. But, you will be able to play ds lite games ont the 3DS.
Yes you can play Nintendo DS games on a Nintendo ds lite.
Yes, you can play DS lite games on the DSi as well as the DSi XL
It can play GameBoy games and DS games.
No. There is no way to download or play DSiWare games on Nintendo DS or DS Lite systems.
Yes, DS games are region free.
Yes, they can play the dsi games.
Yes it is a Smaller Version of the original Nintendo DS the only other DS that is a totally new ds is the 3ds although Dsi supports dsi titles that the original and lite versions do not but the 3ds supports all of them. You can also play ds Games on a 3ds but you cannot play gameboy advanced games on a 3ds whereas on normal or lite ds you can play Game Boy advanced games.
They might be counterfeit. The DSi has additional anti-piracy protection, compared to the lite, it could be one reason why the games work on the lite but not the DSi.
Yes, the original Nintendo DS as well as the Nintendo DS lite can play NDSi games.