Reflex test has topped the rankings the best free apps Apple AppStore Japan.
App reflexes can be measured.

SINGLE MODE
Is for one person.
NORMAL
Mode so far. Settings screen can be ON OFF of the Sound and Vibration.
LIGHT ONLY
Just lit. The visual reflexes.
SOUND ONLY
Only sound audible. The auditory reflexes.
Vibration ONLY
Just vibrations. The tactile reflexes.

How to play
You leave your finger on the button until the light is on.
Press the button and relit.
Displays the time for you.
Record the time the best time ever.
The best time is recorded each day throughout the day. Up to 50 days

9 Buttons
Measure the reaction rate.
Press the button 9 times. Location is determined randomly glowing. Once I pressed light. You might get a good time to remember where once shone.