Your goal is to get all the marbles in the level into the hole! The number in the top left of the screen is the amount of marbles that have to get into the hole. To make a marble move, left click near it to create a blast and watch it roll!
There will be boxes in the level – these are extra marbles you can unlock! Have your marble collide into the box to obtain them. The amount of balls in the box are displayed on the box. When you have multiple marbles, you can press the arrow keys or A or D to switch between which marble you want to have in focus.