Great idea, but I expect more meat on my burger.
Puzzle mode is quest mode except the line of balls don't move and you only have a certain amount of balls to shoot at the line. Your objective is to use all the balls to destroy the line of balls without leaving any balls left in either stock.
Challenge mode is a basic quest mode except you go as long as you can.
There is also a multiplayer mode in which you are able to use download or multi-cart to go head to head.
Together, you'll have around 200 different challenges to do. It's really quite a fun game for awhile. Sadly, many of the modes are so comparable to Tetris DS or another puzzle game availabe that modes seem meager compared to that of better and cheaper puzzle games. Wait for this to come down in price and snag it.