It seems my wife has been playing this rather a lot, so many of the Puzzle Mode and Quest Mode levels have been completed already. Of course, you can go back and do them again.
So I did some of the earlier quests, tried the “newest” open one (and failed), tried the second Challenge in that mode (and got to level 69/99, rubbish) and completed a few incomplete puzzles in Puzzle Mode. I played them all with my new DS Lite Rumble Pak too, which arrived yesterday. It doesn’t add a lot to the game, but it’s nice anyway.