Games
Quick brain games, 1-3 minutes each
Four short games: reaction time, memory, find-the-ninja, and flag quiz. A useful way to redirect attention during a brief break.
Reaction time averages five rounds in milliseconds. Below 200ms is fast; above 300ms is around average. The memory test uses the digit-span paradigm to measure working memory — an average of seven digits aligns with the well-known limit George Miller established in 1956.
Find-the-ninja grows from a 5×5 grid to 13×13 across rounds, measuring visual scanning and focus. The flag quiz pulls ten 3-choice items from a 65-country pool; one wrong answer per question comes from the same continent as the correct one, so guessing by region alone tends to fail.
5 tests
Frequently asked questions
QHow is reaction time measured?
We measure the gap between the screen turning from red to green and your click, averaged over five rounds in milliseconds. Below 200ms is fast; above 300ms is around average. A mouse is usually 20-40ms faster than touch.
QWhat's the average memory span?
The digit-span test follows a sequence of numbers; the human average for working memory is about seven digits — matching George Miller's 1956 'magic number 7±2.'
QAre scores saved to a leaderboard?
Yes. Score-based games like reaction time record an auto-generated anonymous nickname on the leaderboard. No real names or personal data are collected, and you can change the nickname any time before submitting.
QCan the flag quiz be solved by guessing?
Not easily. It pulls 10 questions from a 65-country pool, and one wrong choice per question is from the same continent as the answer — so guessing by region tends to fail.
QDoes it work on mobile?
Yes, all games support mobile touch. Reaction time is most accurate on desktop with a mouse due to input latency, so compare results on the same device.