Totally addictive. I love it! My only tiny suggestion would be to have a short delay when you win so that you can see the solution before the re-start button comes up (the 'reward' of finishing).

Would it be possible to implement image.rotation and rotateAnimation() so that the tiles actually spin when clicked?

Oh yeah, bigger boards would kick ass.

Amazing. I love it. every lvl has a way to win, and even once you figure out an easy way to do them all it's still fun. good job man.

Insanely Addictive.
Only suggestion would be to allow both smaller and larger sizes, and to implement a timer to keep track of the time taken to complete the game.

I made this game as a square version of a similar hexagonal game that I wrote in flash(which you can find at http://www.playdeez.com/default.asp?View=Item&ItemID=2 and requires flash player 7 or better).

I have found that the only type of scoring metric that works with games like this is the time taken to solve the puzzle. Number of moves taken is no indicator of skill, as puzzle A might require twice as many moves as puzzle B(this extreme is unlikely, but there is a great deal of variation be…tween games with the same sized board).

If I do an update (and this is likely), it will include various sizes (from 4x4 to 16x16), and will keep the best time for each of the sizes, and most likely will include the use of Shift-Click to lock and unlock pipe sections. More

No idea whether there will be newer versions, but some suggestions, if that's ok.... As it is generated, size of the board could be customizable, no? And maybe a time limit, so each level becomes more difficult as you have less time to solve. Point awarded for as less clicks as possible might add to the fun as well. I don't know, cool game, I guess :-)