You simply point your cursor where you want to shoot, then click. Once you shoot next to three of the same colored balls, they will be eliminated. Try to plan your shots strategically. When you remove the balls, consider whether the next colors will also be eliminated. Also shoot over two balls lines up in the same color. This will make it faster to clear the board. It’s a fun game you can play at your own pace. Just don’t take too long per level.