There are six basic things in this game:
The clear bubbles, which will be pushed if there is nothing behind them and popped if there is.
The blue bubbles, which will only be popped if a rock goes through them. The rocks, which go through any bubble it hits until it is stopped by an obstacle.
The treasure. The aim of the game is to push the treasure into a chest. When you've done that, you move up a level. It is indestructible. The obstacles, which can't be moved at all. The small treasure, which you can collect for 10 points.

Beware of these:
Pushing your treasure against a wall. You can never get it off the wall, and if it is pushed into a corner, then it can't be moved.
Enemies. they can push bubbles or pop them, and if they or a bubble they push hits you, then you're toast. A special type of enemy moves at half speed and creates bubbles as he moves.
Traps. Consider exactly how you'll get your treasure in the chest before you start, because you can get trapped.

In some of the later levels, think REALLY carefully before you move things. One bubble misplaced could mean you have to restart the level. If you land a bubble or some treasure in a corner or a continuous wall, there's no possible way to get it off. Sometimes you have to place a bubble on a wall so the treasure will run into it and won't get stuck. If you can't complete the level, hit enemies with bubbles until you don't get points anymore, THEN restart.
If you have Internet Explorer, sometimes when you start a level, hold on the window bar, which stops the game, and try to figure out how to get the treasure in the chest so the enemies won't get you when you try to figure it out.