The object of the game is to destroy the balls.  Each ball is a mini bomb, which will only explode when it is horizontally or vertically adjacent to another ball of the same color.  You have an invisible magnet outside the brick walls, which pulls all objects toward it.  Use the arrow keys on your keyboard to move the magnet left, right, up or down to pull all of the objects together in that direction.  The non-ball objects also move toward your magnet, but cannot be eliminated.  These objects simply act as an obstacle when bringing the balls together.

Each level has a maximum number of moves, so you'll need to use strategy and forward planning to eliminate the balls within these moves.  If you have not destroyed all the balls within this maximum, you will lose that level, and the level will reset itself.  Similarly, if you reach a point where it will be impossible for you to eliminate all the balls within the set number of moves, you will lose and the level will be reset.  If, however, you successfully remove all balls, you win the level and advance to the next level.