Stop the Clock
LiveStart the clock, then stop it the moment you think exactly ten seconds have passed. No timer to watch — just your own sense of time. Five silent stops, closest wins.
0 of 5 attempts completed in this round
No personal best saved yet — this run can set one.
How to play
- 1
Start the clock
Tap the dial and the time starts running. From here on the screen shows nothing timed — you cannot peek at the clock, which is the whole point.
- 2
Let ten seconds pass
Count it however you like: a slow beat, a song lyric, a steady "one elephant, two elephant". Whatever you use, keep it consistent.
- 3
Stop it on 10.000
Tap the moment you think exactly ten seconds are up. Your stop time appears to the millisecond, plus how far early or late you were.
- 4
Do it five times
Every attempt counts. Your closest stop is your score, and your median decides tournaments — one lucky stop is not enough.
Works with a mouse, a touchscreen or a keyboard. Tap or click the dial, or press Space or Enter while it has focus. There is no countdown to watch — that is the challenge.
How close is good?
Most people are between 200 and 500 milliseconds out on a first attempt, and get noticeably better after a few tries on the same device. Counting too fast is the usual error — nearly everybody stops early rather than late.
20 msRidiculous
You feel time rather than count it.
60 msSharp
A genuinely good human stop.
150 msSolid
Better than most first attempts.
400 msLoose
Roughly a third of a second out — normal.
A stop within 20 milliseconds means you are feeling the interval rather than counting it, which is rare without practice. Anything under 60 ms is a strong stop and a fine score to defend.
Why ten seconds?
Ten seconds is long enough that you cannot simply react, and short enough to replay instantly. In Tournament mode everyone gets the same five silent stops, so the standings compare steady timing rather than luck. Your personal best is saved in this browser only, so it survives a refresh without anyone signing in.
Play it with a group
Switch to Tournament mode, add up to ten names and pass the device around. Nobody plays cold — each player gets a handover screen with the rules before their turn — and the standings rank everyone by their median miss. Share the result card afterwards and anyone who opens it gets the same target.
Your browser and device add a little delay of their own, and a screen refreshing at 60 Hz can only register a tap 16 milliseconds apart. Treat scores as a fair contest on one device, not as a scientific measurement.