About

Clockstop is a daily precision timing game. Each day everyone gets the same target time. You have 3 attempts to stop the timer as close to it as possible.

The timer is fully visible — seconds and milliseconds both ticking in real time. The challenge is purely physical: your reaction time is your enemy.

How hard is it?

Human reaction time averages 150–250ms. Elite gamers get to around 100ms. Getting within ±10ms of the target is exceptional. Getting ±0ms in 3 tries is nearly impossible.

The leaderboard resets every day with the new target.

The name

A millisecond is one thousandth of a second. That's what you're fighting for.