Brain training games
Play a few rounds a day, keep your brain moving
Test and train your brain with quick games.
All games12 games
ReactionReaction Time TestWait for green, then press. See how quickly you react.PlayAbout 45s
MemoryDigit Span TestDigits flash one at a time. Type them back in order and see how long a string you can hold.PlayAbout 60s
Coming soonReactionAim TrainerThirty targets, one after another, as fast as you can hit them.60s
Coming soonReactionChoice ReactionDifferent shapes, different keys: reaction time with a decision in it.90s
Coming soonMemoryVisual MemorySquares light up in a grid. Tap them back, one more each level.2 min
Coming soonMemorySequence MemoryTiles light in order and you repeat it. The sequence keeps growing.2 min
Coming soonThinkingSudokuNine by nine, one to nine, no repeats in any row, column or box.5-30 min
Coming soonThinkingCode BreakerGuess the hidden combination; each guess tells you how close you were.2 min
Coming soonAttentionSchulte TableTap 1 to 25 in order across a scrambled grid, against the clock.60s
Coming soonAttentionStroop TestName the ink colour, not the word. Harder than it sounds.90s
Coming soonSpatialMental RotationTwo solid figures: the same object turned, or its mirror image?3 min
Coming soonSpatialSliding PuzzleSlide the tiles back into order. The empty square is your only room to move.3 minFAQ
Do brain training games actually work
It depends which skill. Spatial training has the strongest evidence: the Uttal et al. meta-analysis of 206 studies (Psychological Bulletin, 2013) found an average effect of g = 0.47 with transfer to untrained spatial tasks. Memory and attention training is the opposite -- trained scores rise, but transfer to everyday performance has stayed weak, per the Simons et al. review (2016). This site reports that difference instead of one blanket answer.
Are online cognitive tests accurate
Accurate for comparing you against yourself, much less so for comparing you against other people. Browsers and hardware add tens of milliseconds of their own -- Bridges et al. (PeerJ, 2020) measured 15-67 ms of visual lag and 8-48 ms of input lag -- so cross-device leaderboards mean little. Keep the device and input method fixed and the change between two of your own sessions is trustworthy.
What can I test for free on this site
Twelve tests across five categories: reaction (reaction time, aim trainer, choice reaction), memory (number memory, visual memory, sequence memory), thinking (sudoku, code breaker), attention (Schulte table, Stroop test) and spatial (mental rotation, sliding puzzle). All free, no account, nothing to install, and a round takes anywhere from one to a few minutes.
Is a brain test the same as an IQ test
No. A formal intelligence assessment is a standardised battery with published norms and an administration protocol, given and interpreted by a trained professional. This site measures your performance on one specific task -- how many digits you held, how many milliseconds you took -- and converts it into no intelligence score and no diagnosis.
How often should I practise
No reliable research supports a specific daily dose, so this site does not prescribe one. Fixing the conditions matters more than fixing the duration: same device, same input method, roughly the same time of day, so that two sessions are comparable. Each test runs under a minute, and three to five rounds is enough for a stable number.
What is the difference between a Schulte table, sudoku and a reaction test
They measure three unrelated things. The Schulte table measures how fast you locate targets in a cluttered field, scored in seconds. Sudoku measures deduction from stated conditions to a single answer, scored in time and backtracks. A reaction test measures the gap between seeing and acting, scored in milliseconds. The three scores are not comparable and should not be averaged.
Can children and older adults use these tests
Yes -- none of them has an age requirement beyond recognising numbers and colours. Just do not read the results against adult reference ranges: children's abilities shift with age anyway, and reaction time in older adults is generally slower than the early-twenties peak. In both cases the useful signal is the person's own change over a few weeks.
Do these tests collect personal data
No. Scores are written to your browser on this device only. Nothing is uploaded, no account is needed and no personal details are asked for. The trade-off is that clearing your browser data or switching devices loses the history -- that is the cost of not handing over any personal information.