You can't delete a game, as they are on the game cards. If you mean the data, you should be able to delete it in the options menu of that specific game.
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I dont think you can.
Yes, the original Nintendo DS as well as the Nintendo DS lite can play NDSi games.
You can't.
All Nintendo DS are region-free, there is no regional lockout. Any Nintendo DS game will work with any Nintendo DS, and any Nintendo DS game is compatible for multiplayer with another Nintendo DS game, of a different country of origin. I DON'T KNOW!!!!!!!
No. There is no way to download or play DSiWare games on Nintendo DS or DS Lite systems.