By pressing the left mouse button and dragging the mouse create the box above the balancer! Once the box is created and after 5 seconds it still exists you get the score that equals to the box dimensions! Try to create as many boxes as you can and as big as possible! There is size limit for the box, green color specifies allowed dimensions!
You have 5 lives, each box that touches the floor takes one life! If you have zero lives or any part of the balancer will touch the floor => game over!