Click anywhere after the screen turns green. You will then be given a rough estimate of your click reaction time. If you click the screen before it turns green it will stop the project.
First project in a while lol enjoy Change log: 7/4/2018: Fixed bug where the user could spam click before the screen changes to green, receiving an inaccurate score. 7/11/2018: Fixed bug where rawTime variable would show on launch. 7/16/2018: Fixed bug where you could click the ready button after it disappeared. (Thanks @IryRasmo)