No, the 3DS is region locked.
Yes, You do have to have a 3Ds to play that game. But there is just "NintenDogs" You can play this game on a DS or DSi but I'm not sure if you can play that game in the 3Ds. Hope this Helps
You play 3DS games on a 3DS, not on a computer.
Yes, you can play any ds game on the 3ds
No, you cannot, it is a 3DS game and will only run in a 3DS.
There is no 3DS-exclusive Brain Age game, but you could play the DS Brain Age game on a 3DS.
You can play a DS game on a 3ds but you won't see the game as 3d even with the selection on.
Nintendo 3ds
No, it is a 3DS game.
No a Nintendo 3DS can not play a PS3 game of any title
No, 3DS games can only be played on a 3DS.
No, it is a 3DS game and only works on the 3DS.
No, you cannot play 3DS games on a NDSi or NDS