Measure the reaction rate.
There are two different games.
[Fast push] Tap the button turns red! Measures the time until the tap.
[Kinetic vision] 12 Tap the button turns red! Measures the time until you tap it.
Measurements can tweet on Twitter.
[Fast push] It is wonderful when this result is 0.23 seconds or less.
[Kinetic vision] It is wonderful when this result is 3.5 seconds or less.