yes it is
DS games can be played on the 3DS but 3DS games can't be played on the DS.
Yes every DS game is compatible with the 3DS I believe.
Yes, the 3DS/2DS is backwards compatible and can play DS and DSi games.
Yes, the 3DS will be backwards compatible with the DS, but the standard DS games will not be in 3D.
Yes, New Super Mario Bros. is compatible with the Nintendo 3DS, but it is specifically designed for the Nintendo DS. You can play the DS version on a 3DS because the handheld is backward compatible with DS games. However, the game won't take advantage of the 3D features of the 3DS.
Yes, the 3DS are backwards compatible.
No, you can play it either on the DS or 3DS, since the latter is backwards compatible with DS games. You can't have the 3D effect, though.
No, you can play it either on the DS or 3DS, since the latter is backwards compatible with DS games. You can't have the 3D effect, though.
You can use Online in all Nintendo ds titles on the 3DS. you will need to change setting for the DS internet in options on the 3DS menu, because 3DS internet connection settings is different to DS Connection settings.
It's compatible with every model of ds except 3ds
Pokémon Conquest is a Nintendo DS game but can be played on a 3DS since it's backwards compatible with DS games. You can't have the 3D effect, though.
The DS and DSi are not compatible with 3DS games and cannot play them, including DS download play.