Try to pop all the balloons with your darts, but don't touche the frozen ones or you yourself will be frozen! Progress through the 12 levels of increasing difficulty: the goal in each level is not a certain amount of balloons to pop, but a percentage of balloons relative to the total in the scene: in the easy first level it's enough to pop 40% of the balloons to pass to the second level.
Keep pressed the left mouse button to give power to the shot. Move the mouse to give it direction. Release the mouse button to shoot.