I had a similar problem with MP3, about a lot of red pixels showing up and so on, I simply washed the disk, and it was fine. With SMG, the game stopped playing, so I washed that too, and they were fine. People should check that (not that you should have) before they send it in. I believe that is a very common reason to think it is broken.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS







