Stopwatch game, is a very simple game where you must push the button at the exact moment that the rightmost digit of the clock is zero. Each level requires you to hit certain times and in a certain period of time.
There are ten very challenging levels, you can still get achievements and if you get achievements needed may play mode survive and compete who's better with other players. Press space key when the rightmost digit of the clock is zero, each level requires a certain amount of hits.
Check achievements menu to to learn how to get them, get some of them and unlock survive mode, get as much achievements as you can and earn mochi trophies.