you move your ball quickly in order to shun from the falling balls. You can use the left and right arrow-keys to go left or right, look out for the balls especially the green one which is close to the grounding color falling from upward side. You have three chances through the whole game, when you reach one hundred fractions in one level. You turn to the next level automatically. If you hit the other balls, your life amount decrease one, then you can press the space key to resume. There will be more and more balling falling as your level ascending. When you lose all of your lives, the game is over. Are you ready? Have fun.