This is a good puzzle game, and really suits the DS. The graphics are bright, pleasing and well animated. The game controls are really simple (3 buttons or 3 directions on the D pad), but the thought required to solve some of them will be a challenge to most people. I really enjoyed playing it and I still pick it up for a fiddle now.
It is strangely addictive because it is so simple to control, but not so simple to solve. The stylus isn't used at all (even in the menus) but that's not an issue on the DS. It would be slower to operate using the stylus anyway.
There is a free flash demo on the web - if you are curious then do try this first as it identical to the DS version. It's a great little puzzler - easy to pick up and play anytime because the puzzles don't last very long. My only issue with it is that there are only 30 puzzles when I would expect 100 or more. There are 3 game modes and they all use the same 30 puzzles. You will complete all of the puzzles pretty quickly, then find yourself redoing them to minimise your time score. Then you'll periodically come back for a fiddle to do the more complex puzzles again.
This is a small game and probably not worth more than £10 or £12 only because there are only 30 puzzles, but these 30 puzzles are very good. Also, I would only have it on a DS or PSP, not a TV console. This game is only £8 new at PlayTrade, and it is well worth this price. Try the demo first.