Click and hold on a bug to select, then aim with your mouse and release the mouse button to shoot and connect them. Bur remember you must target bugs with same color. The bigger the distance betwen them. The higer your score will get. The green bar is showing your live status, each time you miss a shoot you lose life. You gain life each time you connect two bugs of the same color. Your score increases according to how fast you shoot , the distance, and the bugs color