Less hardcore, but still kind of cool, are the two 200-point apps also releasing on September 2. Nintendo DSi Metronome is, well, a metronome, that allows users to input their own beats and tempo to play along with, and even record their own drum sounds. It has multiple "skins" including a Game and Watch look, and Balloon Fight and Donkey Kong minigames; the latter of which involves clapping to make Mario jump over barrels. Hey, it's a Mario counterpart to Jungle Beat! Except really simplified.
Nintendo DSi Instrument Tuner also includes a Game and Watch skin. This useful program allows you to play an instrument into the DS mic and get information about its pitch.