If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Hit the balls using the white color ball to make the balls reach the fence. To increase the hitting power, click and hold the mouse, and release it to move the white color ball. Make the balls reach the fence before the time gets over. To mute the sound, click the mute button, or press M on the keyboard. To bring the game to pause, click on the pause button, or press P on the keyboard.
Use mouse to interact.