Tap on green
Dopa Reflex
The instant it turns green
- Reflex
- Phone or PC
- About 30 seconds
What is it?
Tap the moment the red screen turns green. Five goes; the average is your record. People land around 250 ms — under 180 ms is genuinely fast.
Yellow feints appear now and then. If you are reacting to "the colour changed" rather than "it is green", they catch you. A false start is not recorded; you simply redo that round.
The screen also says what to do in words ("Wait", "NOW"), so it works if colours are hard to tell apart. The space bar works too.
How to play
- 1Tap to startWait while it is red. The wait is different every time.
- 2Tap on greenYellow is a feint — tapping it means a redo.
- 3See the averageSeven ranks. Your best stays on this device.
Ways to use it
- Alone
Before bed and after waking
The same person swings about 50 ms across the day. It doubles as a gauge of your own state.
- Two people
Take turns on one device
Five goes each. Who falls for the feints is where the gap opens.
- Three or more
Find the fastest
One run each and rank them. Thirty seconds a person, so a big group still moves fast.
Updates to this game
- NewSep 20, 2026
Added "Dopa Reflex"
A reaction test with feints: tap the instant it turns green