If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
You are in a control of something that looks like a goalkeeper launcher and on each level you will notice that more than one ball are located in different positions. So, launch the goalkeeper figures in the direction that will succeed catching the balls on the way and to achieve that, you need to be very, very precise each time! It's very interesting! Use your mouse to control, and you'll see how it goes.