I'll bet the only reason it won't work is a save-type-thingy. As a matter of fact, I had to manually create a 2048kB save-file to get Rittai Picross working on M3 DS-real. So maybe a different size save-file might get this GTA going, who knows... because it does run on no$gba. I'm not going to try it though, busy playing Rittai Picros.