The game only has a few simple rules, but puzzles can quickly become complex as the pieces start interacting.
Unlike most puzzle games, the pieces you use will change as they collide with other pieces, making the whole game dynamic. You will often have to use these interactions to create pieces that you need to complete a level.
And get creative. Whether or not you clear any of the 120 set levels, you can Create your own levels and Export them to your photo albums so you can share them with your friends as you would any other picture. Email them, put them on your website, Facebook, whatever, so they can Import your level into their game. Will you devise the most fiendishly tricky level yet?