Brain Duel – Free Online Brain Test & Reflex Challenge

Brain Duel is a free online brain test and reflex challenge you can play in your browser in about 90 seconds. Six short challenges measure reaction speed, attention, pattern recognition, logic, memory and decision making, and the run ends with a single Brain Score out of 1000 plus a breakdown by skill. There is nothing to install and no signup: open the page, tap start, and play on a phone, tablet or desktop with touch, mouse or keyboard.

How the brain test works

Reflex test — tap the moment the target symbol appears, and not before. Tapping early counts against you.
Attention test — watch a fast stream of shapes and count the ones that match the question.
Pattern test — work out what comes next in a number or colour sequence.
Logic test — solve a short reasoning puzzle with fresh values every run.
Memory test — memorise a short sequence of numbers, colours, symbols or grid positions, then reproduce it in order.
Decision test — react only when a specific combination appears, and ignore the distractions.

Features

Six challenges in one 90-second run, with a progress indicator and a timer
A Brain Score from 0 to 1000 with category scores for reflex, attention, pattern, logic, memory and decision
Fastest reaction time and strongest skill shown at the end
Every session generated fresh from a random seed, so no two runs are the same and there is no question bank to memorise
Answers and reaction times validated on the server, so a score cannot be faked in the browser
Challenge a friend with a signed link, then compare scores and rematch
Works on mobile and desktop with touch, mouse and keyboard

Tips for a higher Brain Score

In the reflex test, rest your finger or cursor ready and tap once. Early taps are penalised.
In the attention test, read the question before the stream starts and count out loud in your head.
In the memory test, group the sequence into pairs rather than single items.
Do not rush the pattern and logic questions: a wrong answer scores zero, a slow right answer scores full marks.

Frequently asked questions

Is Brain Duel an IQ test?

No. Brain Score measures speed and accuracy on these six challenges only. It is a quick brain workout and a way to compare runs with friends, not a scientifically valid IQ measurement.

Is Brain Duel free?

Yes. It is free to play in your browser with no download, no account and no signup.

How long does a run take?

About 90 seconds for all six challenges. If the timer runs out, the challenges you have answered are scored and the rest count as zero.

Can I play it on a phone?

Yes. Every challenge is built for touch first, and the layout scales to a phone screen.

How does the friend challenge work?

After a run you get a signed link with your score in it. Your friend opens it, sees your score, plays their own freshly generated version at the same difficulty, and the two of you can compare results and rematch.