The object of the game is to stop the timer at an exact second. There are 10 levels, each with a different amount of time. Your score is based upon how close you are to stopping it at the exact second (eg. 5.000 seconds). Your scores for each level are combined and at the end of the game, the game checks to see if you have set a “low score” (lower scores are better). If you have, your low score is updated.

http://forums.qj.net/showthread.php?t=142291