Welcome to circle online, a challenging HTML 5 free game. Tap to control the circle jump along the line and don't touch it. Collect diamonds to unlock new circles. Simple play and scene, but more attractive and challenging. It is a good game for you to kill some time! Train your reflex skill and relax your body and mind. You can play circle online on your cell phone or computer at once, don't need to download it. Are you ready? Let's get started.