How Free Brain Test Scoring Works: Brain Score, Domains and Percentiles

02 — The standfirst

No account does not mean no rigour. The scoring runs on the same task shapes psychology labs use, and the raw numbers are kept alongside the headline score so a retest tells you something honest.

The format is fixed. The Full Brain Test runs five timed challenges back to back and rolls them into one Brain Score, read IQ-style, where 100 sits at average. Quick mode gives you three stages in about two minutes. Full mode gives you all five in about five minutes.

Every drill is scored in its own units first. Reaction tasks score in milliseconds, span tasks score in digits or items, accuracy tasks score in correct responses. The Brain Score sits on top of those raw numbers rather than replacing them.

That matters the second time you play. A thirty millisecond drop on a reaction drill, or one extra digit held in a span task, is a change you can read straight away, even when the headline score barely moves. Averages hide progress. Native units show it.

Your percentile compares your result with other anonymous players who did the same task. It tells you where you sit today, not what you are. Different crowd, different time of day, tired hands or a trackpad instead of a mouse, and the number shifts.

There is no account and nothing to confirm by email. You play in the browser, your personal bests are stored on the device you used, and the global rankings carry no names. Clear your browser data or pick up a different phone and the history starts again.

Retesting works best when you change one thing at a time. Same device, similar time of day, then drill the domain that came out lowest before you test again. Speed, memory, attention and skill drills all exist for that reason.

03 — The five domains

Here is what each stage asks of you and what a good result looks like in plain words, so the score on the end screen is not a surprise.