All you need to do to play this game is click or press a key. Try to click when the pulsing circle gets to the edge of the still circle, because the still circle will become the size of the pulsing circle when you click. If it gets to small, game over. If you click it when it is exactly on the edge of the still circle, you get a score multiplier that increases every time you get another perfect click consecutively. To save your highscore, click "Open in New Tab".