Motley Blocks (iPhone iPod)
CheatingDome.com
Bomb
A chain will end when you add a bomb to it, so before you slide over the red cubes think carefully.
Restart
Do not waste your time, you might as well restart if you miss a block on the last lap.
Wrong colour cube
Do not waste all your hard work by adding a cube of the wrong colour, doing so will cause your chain to collapse.