Stop the Clock: can you hit 10.00?

The 10-second challenge, five times over

Everyone has tried it: start a stopwatch, look away, and stop it at exactly ten seconds. It sounds easy until you try. Stop the Clock turns that little challenge into a duel. You send the link, your friend joins, and you both play the same five rounds with the same targets.

In the classic game every round is 10.00. You watch the clock start, and somewhere between 2 and 5 seconds it goes dark, a different moment each round. From then on you count in your head. Want more? The Five twists mode gives every round its own challenge, from a countdown to a clock that vanishes after one second. Every stop shows how far off you were, and the smaller total wins.

Two ways to play

Classic is the 10-second challenge, five times. The target is always 10.00, and the clock goes dark somewhere between 2 and 5 seconds, at a different moment each round. You never know how long you get to watch it.

Five twists gives every round its own challenge:

• Watch it: an odd target between 3 and 6 seconds, and the clock stays in sight. Pure timing of the tap.
• Lights out: a target between 5 and 8 seconds. The clock goes dark after 2 seconds.
• The classic: exactly 10.00 seconds. The clock goes dark after 3 seconds.
• Countdown: the clock counts down from a target between 6 and 9 seconds, goes dark after 2 seconds, and you stop it at 0.00.
• Blindfold: a target between 12 and 16 seconds, and the clock goes dark after just 1 second.

Whoever sends the link picks the mode. In both, the two players get exactly the same rounds in the same order, so nobody gets an easier one.

How good is your inner clock?

Most people can stop a clock they can see within a few hundredths of a second. Without the clock it gets much harder: when people judge a few seconds in their head, they are usually off by a few tenths of a second, and the longer the time, the bigger the gap. Being off by more than half a second on a blind 10 seconds is normal.

Stopping a blind round on the dot is mostly luck. Getting close again and again is a skill, and that is what wins the duel.

Tips for a better stop

• Find a steady count. Counting “one thousand one, one thousand two” or tapping a foot helps you keep the beat once the clock goes dark.
• Lock in the speed while you can see it. Use the seconds before the clock goes dark to match your count to the hand.
• Do not rush the end. Most people stop too early when they get nervous. Trust your count.
• Do not wait for the dark. In the classic game the clock can go dark after 2 seconds or after 5. Start counting from the very first second.