I just got the 3DS and I already had this game. Since I traded in my old DS Lite for this new system, I can of course only play it on the 3DS now. Problem is, I can't seem to connect it to the internet for wifi play. The 3DS by itself connects fine, as i was able to download the firmware update no problem. I'm starting to think the online capabilities of mario kart ds are not compatible with the 3ds.
anyway else have this issue or know what i may be doing wrong?