Try to stay inside the window while avoiding all the obstacles. Grab the blue powerups and click to activate them and earn a bonus. The more tricks you do, the more bonuses you get: combos (three tricks in a row) are worth even more. You can see which tricks there are in the 'tricklist' in the 'instructions' menu. The longer you stay inside the window, the higher your score will be. Go for it!
Use the mouse to control the green box.