Yes, DS games are region free.
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Normally, you can play new DS games on old DS. But if the games says for DSi only, or for 3DS(will be pubulished soon) only,the it can not play on old DS.
Yes, the NDS lite can play all DS games
It can play GameBoy games and DS games.
Most likely, the DSs aren't any different.
No it is IMPOSSIBLE to play DS games on the Wii but you can play Nintendo Gamecube games with the Gamecube controller