Reaction Time

Press any key, click the mouse, press a button or gamepad button  as soon as a happy face is shown on screen. The reaction time will be measured.

Can you lower 0.3 seconds ?

Optionally if "Fool" mode is selected, some no-happy-face images could appear instead before the proper one to force you to stay more focused.

Check "Repeats" to 5 times for more challenge.