Yes, DS games are region free.
There are only a tiny handful of 'DSi games', games which specifically need the DSi's camera to play. Most are even DSiware. So technically all DS game cards will work just fine on a DSi, there's no need to do anything to get them working.
You can download games/apps for the DSi via the DSi Shop.
Yes, the Nintendo DSi can play Nintendo DS games. The NDS and NDSi are compatible with each other and can link for multiplayer as well. There are really no such thing as 'DSi games' except for DSi-ware and one or two games that require the DSi camera, none of which are compatible with a DS. However, since the DSi has no GBA slot, Game Boy Advance games and DS games that require this slot (e.g. Guitar Hero: On Tour) cannot be played on a DSi. Flash carts and unofficial hardware won't work either, but there may be a newer version available, designed for the DSi. Another problem you might find is that if you have any Wi-fi capable games, they will only work with a WEP security enabled network (or of course a network without security), not WPA.
go to sound on the dsi menu and select play with music on sd card
Yes, DS games do work in a DSi XL. The DSi XL is part of the DS line, so DS games are meant to work with it.
Yes,they do work on a dsi.
All of the games that work for any DS will work for DSI XL.
Yes and I have all the games and I play it with the Dsi
Yes, the DSi can play DS games
No, they only work on the 3DS platform. But, you can play DSi and DS games on your 3DS.
yes it will
Yes, dsi games works on the 3DS also DS games work on the 3DS.
No, dsi games work in a 3ds, wont appear 3d though, but the dsi does not have the ability to play 3ds games.
Yes. All DS games work on all DS systems.
AAC is supposed to be the format for dsi but m4a works on mine
Yes probably, but it will be in Indian.