REACTION CHALLENGE
Lights out.
How fast are you?
Wait for all five lights to go dark, then react as quickly as you can. The delay changes every time—anticipate it and you’ll false start.
REACTION TEST
Attempt 1
Watch the lights
Click, tap, or press the space bar when the lights go out.
01
Get ready
Start the sequence and keep your pointer, finger, or space bar ready.
02
Do not guess
The hold after the fifth light is randomized. Reacting before darkness is a false start.
03
Find consistency
Your last ten valid attempts are saved on this device so you can chase a better average.