Stopwatch Application, which includes photos & voices of "Morning Musume" ( Japanese famous idol) on its timeline.

Let's find and complete them measuring time.

For example, try to stop 0:00:03:0 or 0:01:00:0.
0 millisecond is important for getting something.

If the time is a jackpot, you'll get pics (and voice, sometimes).

If you fail to stop on 0 millisecond,
the meter will be turn red, gradually.
When the meter turns red completely, you are forced to be back to 0:00:00:0.

Though there is no pics or voice, if you succeed to stop on 0 millisecond,
the meter will recover, slightly.

Sometimes, you will get warp hole, that leads you at a specific prior time.

Finishing this app with measuring time, when you run this app again,
you can continue measuring time added time since you quit before.
So you are free from fear of the loss of battery.