What this is
Tap the moment the screen turns green. The time between the signal and your tap is your result.
You play five rounds and the average is your score. A single round would let one lucky tap top the board; five rounds show something closer to real ability.
Scores are in milliseconds. Lower is better.
Controls
The whole panel is the button — tap anywhere. It is deliberately large: a small target would measure your aim rather than your reaction.
- Tap to arm the round (the wait is 1.2–3.5 seconds, and you cannot predict it)
- When the panel turns green and says NOW, tap
- After five rounds you get your average
Tapping before the signal voids that round and you replay it. It is not recorded as a very slow time, because that would reward people who jump early and happen to get lucky. Replaying the round means guessing never pays.
The signal is not colour alone — the text changes with it, so the test works the same if you cannot distinguish the colours.
What counts as fast
| Average | |
|---|---|
| over 300ms | relaxed tapping |
| 250–300ms | typical |
| 200–250ms | quick |
| 180–200ms | very quick |
| under 180ms | usually means some anticipation |
Seeing light and moving a finger takes roughly 100ms of pure biology. Add display and input latency and a genuine reaction below 150ms is very hard to repeat. Consistent scores faster than that normally mean the timing was anticipated rather than reacted to.
Getting faster
Do not rest your finger on the screen. Pressing from contact becomes an act of squeezing rather than tapping, and often measures slower. Hover slightly instead.
Do not predict. The longer the wait runs, the more you feel it is “due”. A false start costs you the whole round, so it never pays. Move after you see the signal.
Look at the centre. If your eyes are on a corner you catch the change in peripheral vision, which costs you a beat.
Keep your posture fixed. Shifting your hand between rounds changes the conditions and makes your average noisy.
Daily challenge
A new set opens every midnight (KST), and that day even the waiting times are identical for everyone — round one waits this long, round two that long, fixed by the seed. If the waits differed, knowing when the signal comes would itself become a skill.