First of all, click singleplayer or multiplayer. Multiplayer will tell you how to control, but with singleplayer you need to move the mouse to control all 4 bars! Keep the ball in for as long as you can by bumping it on the bars. It it gets stuck, you can usually pry it out using 1 or 2 of the bars. Good Luck! ;D
This is my project to celebrate the Hour of Code. Even though it took way more than an hour to complete. I was going to doing it earlier, but all of my classmates were asking for help which I didn't mid at all. Happy Scratching! ;)