Click, tap, or press any key to lift the health bar. Avoid hitting black surfaces, one hit and its gameover. Move through the blue lines to score a point, points will be shown when all your health is lost. Blue dots will cause 15 damage points to your shield, when it is lost you will be vulnerable to red squares, these cause 1 health bar to be lost when hit. However when your shield is lost additional points can be obtained by collected the blue dots. Your starting health, shield strength and regeneration are chosen from the menu screen. Aim to beat your average score displayed upon losing all health bars.