What these games measure
Each game isolates a single, well-defined cognitive ability rather than trying to score you overall. That is deliberate: narrow tasks are the only ones a browser can measure with any consistency, and knowing which specific ability a task taps is what makes the result meaningful.
| Game | Ability measured | Scored in | Time |
|---|---|---|---|
| Number Memory | Working memory span | digits remembered | ~2 min |
| Reaction Time | Processing speed | milliseconds (average of 5) | ~2 min |
| Visual Memory | Visuospatial memory | levels cleared | ~3 min |
| Chimp Test | Spatial working memory | numbers held at once | ~3 min |
| Stroop Test | Inhibitory control | correct answers in 45s | ~2 min |
| Typing Speed | Motor speed & attention | words per minute | ~2 min |
| Sequence Memory | Sequential memory | sequence length | ~3 min |
| Verbal Memory Test | Recognition memory | words survived | ~4 min |
| Aim Trainer | Visuomotor speed | milliseconds per target | ~2 min |
Why cognitive testing is worth your five minutes
The abilities these games measure are not trivia. Working memory span predicts reading comprehension and reasoning performance. Processing speed declines measurably with fatigue and age, and is one of the earliest things affected by poor sleep. Inhibitory control, the thing the Stroop test targets, underpins the everyday ability to stay on task when something more interesting is competing for your attention.
What a five-minute game gives you is a baseline. Most people have never seen a number attached to their own working memory or reaction speed, and the number itself matters far less than what moves it. Play the same game rested and then tired, on a laptop and then on a phone, before coffee and after, and the differences are usually larger than the gap between two random people.
Does brain training actually work?
Partly, and much less than the category usually claims. The reliable finding is practice effects: play any of these games ten times and your score will climb, because you learn the task. You work out that chunking digits in threes beats rehearsing six separate numbers, or that the Chimp Test is about memorising a path rather than eight positions.
The contested part is transfer: whether getting better at a working-memory game makes you better at anything else. Reviews of commercial brain-training programmes have generally found strong gains on the trained task, weaker gains on very similar tasks, and little to no improvement on unrelated abilities or on everyday functioning. That is why nothing on this site is sold as cognitive enhancement.
How scoring and percentiles work
Your percentile answers one question: what share of other players did you beat? Once a game has at least 50 recorded scores, that is calculated against the real distribution of scores played here, using a mid-rank method so that ties on whole-number scores are split fairly rather than all landing on the same percentile.
Below that threshold, percentiles come from published population norms instead. This matters more than it sounds: without it, the first handful of players on a new game would all be told they were in the 100th percentile, which is useless information.
Your own best score for each game is remembered in your browser, so returning to a game shows what you have to beat. Signed-in players also get every score kept against their account and listed under Brain Games in the dashboard.
Frequently asked questions
Are these brain games free?
Yes. Every game here is free with no sign-up, no download and no account. Your score is ranked against other players immediately.
Do brain games actually make you smarter?
You reliably get better at the game you practise. Whether that improvement transfers to unrelated tasks or to general intelligence is much weaker. Large reviews of commercial brain-training programmes have generally found practice effects on the trained task with little far transfer. Treat these as measurement and entertainment, not as cognitive enhancement.
Do these games measure IQ?
No. Each game measures one narrow ability: working memory, processing speed, or inhibitory control. Several of those correlate with general intelligence, but a single browser game under uncontrolled conditions is not an IQ test. A full assessment scores multiple abilities together under standard conditions.
How are the percentiles calculated?
Once a game has at least 50 recorded scores, your percentile is calculated against the real distribution of scores played here, using a mid-rank method so tied scores are handled fairly. Before that threshold it falls back to published population norms, so early players are not all told they are in the 100th percentile.
Do I need an account to see my score?
No. Scores and percentiles show instantly. If you are signed in, your personal best is kept against your account; if not, it is remembered for your browser.
Which brain game should I start with?
Reaction Time is the quickest at about two minutes and needs no strategy. Number Memory and Sequence Memory are the best introductions to working-memory testing. The Chimp Test is the one most people find hardest.
Do the games work on a phone?
Yes, all of them. Scores tend to run lower on a phone for the timing- and typing-based games because touchscreens add input delay, so compare phone results to other phone results.
