How to use
When you start the game, a red ball comes out, so touch the screen at that moment.
The average of five times this is your reaction time.
If you push it before the red sphere comes out, the penalty will be one second for one second.

Benefits of strengthening reaction speed
If the reaction speed is high, you can accurately repel or avoid a flying ball.
It will also be advantageous for games such as FPS and fighting games where one frame separates victory or defeat.