Thanks for the comments, guys.
Sounds ok - if I CAN master it (not sure if that is a big IF or not), it would be good. I've been playing the flash version of Zookeeper, and it's fun, but I'm not a big fan ofthe level system, in that it starts of easy and gets hard (or atleast the way ZK does it). It menas you have to plug away at a basic level just toget to a challenging part, where you die way too easy. My fave puzzler has got to be Tetris (DX) - Tetris just seems perfect, like the way the laws of nature and mathematics have come together to make the variety of four-block pieces the perfect number and the way they fit together just sublime.
Too many puzzlers to me seem too 'random', in that you feel ripped-off when you lose, not becasue you weren't good enough - which is what I lie...to know I lost because my skill wasn't good enough. Also, I liek the difficulty to go way beyond my power, so there's also room to improve - i hate nothing more than a game to plateau before I'm ready. No challenge = no fun (like when you reach a point in a wario game where you can just go forever, and it becomes a test of patience rather than skill).