Biological clock - everywhere

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Stop your body clock ... Stop the stopwatch exactly at the target time! ▼ What kind of app is a biological clock anywhere? It is an app that trains your body clock while having fun! Please compete with your family and friends! ▼ Let's aim for perfection! If you stop it exactly, it will be displayed as PERFECT! Please aim for PERFECT! ▼ You can select the time You can change the challenge time to 5 seconds, 10 seconds, and 30 seconds. The longer you spend, the more you can't stop without having an accurate body clock. By all means, aim for perfection at all times!