Multiplayer hackIn late 2005, hackers, with the help of the homebrew 'Passme" device for the DS, were able to successfully implement a hack that would allow them to play the additional 12 tracks in online Wi-Fi mode. This does not only apply to a single device. As long as one person in the game has the hack, all of the players can race on these maps. As of this writing (Dec 2005), Nintendo has made no official announcement on the issue but it seems likely they'll fix this issue on future Mario Kart DS carts and possibly begin banning hackers from Mario Kart similar to what Bungie did with Halo 2.
ReferencesMario Kart DS marks the first appearance of R.O.B. (Robotic Operating Buddy) as a playable character. R.O.B. originally appeared as an accessory to the Robot Series of games for the NES, and has made subsequent non-playable cameo appearances in other games.
Contributed by MegaMegaMan (1886) on Dec 22, 2005. [revised by : Patrick Bregger (98680)]. -- edit trivia