Are you one of the four roguelike fans out there? If so, and if you also can't wait for Mysterious Dungeon: Shiren the Wanderer's February release, why not play NetHackDS or Powder -- two recently-updated homebrew dungeon crawler ports -- in the meantime?
While NetHackDS has the edge in terms of "graphics" and name recognition, Powder has the advantage of being immediately playable in an emulator, so even if you don't have a flashcart, you can still enjoy the addictive game ... if you consider dying a dozen times while trying to figure out how to live longer than five minutes enjoyable.
See also: Nethack your DS
Read - NetHackDS 1.12C
Read - Powder 094