How to Play the Stopwatch Challenge
Choose a 5, 10, or 30 second target and press Start. The stopwatch disappears after two seconds. Count in your head, then press Stop when you think the target time has passed. The closer you are, the higher your score.
Tips for Better Timing
Count at a steady rhythm and avoid rushing the final second. Try silently saying one-thousand-one, one-thousand-two. Longer targets test concentration as well as timing accuracy.
Free Online Stop the Clock Game
Stopwatch Challenge is a simple timing game that tests your internal clock. Play instantly on desktop or mobile with no download or sign-up. Your best result for each target is saved on this device.