Blindclock
Stop the clock at exactly 10.00 s. It shows for one second, then hides: you do the counting.
Play your first game: your curve shows up here.
Daily challenge
Monday, November 9, 2026
Same targets for everyone. Not played yet today.
Free run
New targets every game.
No account needed: your first run gives you a guest nickname, ranked like everyone else. Create an account to keep your records on all your devices.
Leaderboards
Today
Nobody is ranked on this challenge yet today.
This week
Nobody is ranked yet this week.
Rules
Blindclock measures your inner clock. Each round gives you a target, for example 10.00 s: start the clock, it shows for 1 second then hides, and stop it when you think the target is reached. Your gap is the difference between your time and the target. After 5 rounds, the smallest total gap wins; on a tie, the smallest worst gap.
- Daily challenge: the same targets for everyone, renewed at midnight (Paris time). Only your first run is ranked; the next ones are practice.
- Free run: new targets every game, your best run of the day counts.
- A stop before half the target or after twice the target is missed: it counts the whole target.
- Reloading or leaving the page during a round counts it as missed: no second chance.
- Your page times each round, without the network delay; the server checks that its time stays consistent with its own.
- With the keyboard: Space to start and stop, Enter for the next round. By touch: the big button.
Blindclock: the rules in brief
Start the clock and stop it right on the target, for example 10.00 s: it shows for one second, then hides. Five rounds, five targets; the smallest total gap wins, the same targets for everyone each day.
Blindclock: how to get better
- Set your pace on the visible second: it is your yardstick.
- Count under your breath, one long syllable a second, and do not catch up on a delay: keep the tempo.