This is an awsome game! This game should belong to every DS owner. Its easy at first but then harder and harder and harder. You get to play with another N+ owner. Or just play single player. The single player has ... um like levels inside a level. For example 1-0, 1-1, 1-2, 1-3. Kinda like Super Mario Bros. and other Mario games.
Multiplayer you play with another N+ owner.
There is also level editor. This mode you make your own levels. There are tons of exciting levels on single player mode.