Training/Attention/Letter Cancellation
ATTENTION · VISUAL SEARCH · 60 SECONDS

Letter
Cancellation

Cross out every target letter in the grid before the minute is up. It's a pencil-and-paper test from the 1890s, still used by neuropsychologists today, because how you search reveals as much as how fast.

Difficulty
–found
–wrong
–left to find
Cross out every
E
0:60
Click every E as fast as you can. You have 60 seconds. Wrong clicks count against you.
EXAMPLE SEARCH · PLAY TO SEE YOURS

How you searched, not just how fast

The line joins your crosses in the order you made them. Clinicians look at this: a tidy, row-by-row path suggests an organised strategy, while a path that jumps around tends to miss more targets.

Search organisation86%Mostly row by row, like reading: the most reliable way to catch every target.
4 / 5found on the left half
5 / 6found on the right half
SE
foundmissedstart and end
IN THE CLINIC

A test that can reveal half the world going missing

After some strokes, usually on the brain's right side, people stop noticing one side of space. It's called hemispatial neglect. They aren't blind there; their attention just doesn't go there. On a cancellation sheet the pattern is unmistakable.

LE
RFLPTE
BBRFZE
ZRTBRLBPFBRLKBRE
E
TZRRRPTE
KZKTFPRTZELFRLBZFE
TKKFE
E
KBFRE
BKE
FFFRE
RPTPFFEPE
RLLFTZRZRKL
6 / 8found on the left
7 / 7found on the right
A few misses scattered at the edges: normal when rushing. Misses spread evenly across both sides don't suggest neglect.Simulated for illustration. Online games can't diagnose anything; if you notice sudden one-sided problems with attention or vision, seek urgent medical care.
WHAT THIS GAME TRAINS

Careful, organised scanning

Cancellation tests measure both speed and strategy. Fast players who search systematically find more targets with fewer mistakes than fast players who jump around.

corestrongsomelight
coreVisual scanningSweeping through rows of letters without skipping any.
coreSelective attentionTelling target letters apart from lookalikes.
strongProcessing speedChecking each letter quickly.
strongPlanning and strategyChoosing an organised search path.
OUTSIDE THE GAME

Where you'll notice it in everyday life

01ProofreadingCatching typos and errors in documents and forms.
02Checking dataScanning tables, lists and spreadsheets for specific entries.
03Reading efficiencySmooth, systematic eye movements across a page.
INSIDE YOUR BRAIN

The brain areas doing the work

Step through each area, or tap one below. The matching marker grows on the brain; dashed markers sit deep inside.

Side view of the brain with the four lobes shaded in different coloursFRONTALPARIETALTEMPORALOCCIPITALCEREBELLUM
1
Based on Gray's Anatomy, fig. 728 (public domain)
AREA 1 OF 3
1Parietal lobetop and back
Combines what you see, hear and touch into a map of where things are. It also handles numbers and directing your attention through space.
ITS JOB IN THIS GAMETracks where things are and how many there areRight parietal cortex directs attention across space; damage here causes hemispatial neglect.
DID YOU KNOWDamage on the right side can make people ignore everything on their left, a condition called hemispatial neglect.
ALL AREAS
WHERE TO GO FROM HERE

From paper to the clinic's modern versions

All attention games →

Fast, careful scanning helps on every IQ test. Try the real thing.

Our full IQ test covers reasoning, memory, spatial and verbal ability: 60 questions, about 30 minutes.

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