Colour Vision Test
Colour Vision Test
Tap the square that looks different.
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About Colour Vision Test
This is a colour discrimination test: it measures how small a difference in shade you can still detect. A grid of identical squares contains one that differs slightly in lightness, and your job is to find it. Each level shrinks the difference and eventually enlarges the grid. It is a measure of visual sensitivity and attention, and it is affected by your screen and lighting as much as by your eyes.
How to Play
Tap the square that looks different.
Click the square that looks different.
Objective & Winning Rules
Reach the highest level you can before picking the wrong square.
Colour Vision Test Rules
Every level shows a grid where all squares share one colour except one, which differs slightly in lightness. You select the square you believe is different.
A correct answer advances you a level, which reduces the difference between the odd square and the rest. The grid also grows every couple of levels, from two by two up to six by six, so later levels demand both finer discrimination and a wider search.
The base hue is randomised at every level so you cannot carry an expectation from one round to the next. A single wrong answer ends the test, and your score is the last level you cleared. The difference never shrinks below a floor that remains theoretically perceivable — the limit is your eye and your screen, not an impossible target.
Colour Vision Test Strategy
Defocus and scan rather than stare
Small differences in lightness are easier to catch with peripheral vision than by examining each square directly. Let your gaze go slightly soft and sweep across the grid; the odd square tends to announce itself as a faint discontinuity. Inspecting squares one at a time is slower and, past the middle levels, usually less effective.
Compare neighbours, not the whole grid
Your eye judges relative differences far better than absolute ones. Rather than trying to hold the base colour in mind and test each square against it, scan adjacent pairs. The moment two neighbours look unequal, you have found the region — and often the square.
Fix your screen before blaming your eyes
This test is unusually sensitive to display settings. A dimmed screen, an aggressive blue-light filter, night mode, or a low-quality panel will all cost you several levels. Viewing angle matters too on many laptop screens. If you want a number that reflects your vision, take it at full brightness with filters off.
Work in even lighting
Glare and reflections wash out exactly the small differences this test depends on, and a bright window behind you is considerably worse than a dark room. Consistent, indirect lighting is what makes two attempts comparable at all. If you retake this to see whether you have improved, change nothing about the room or the screen between runs, or you are measuring the lighting rather than yourself.
Guess the region, not a random square
When you genuinely cannot see it, you still have better information than chance. The area your eye keeps returning to is usually where the difference is, even when you cannot consciously resolve which square. That instinct is worth more than picking a corner.
Game Features
Pro Gameplay Tips
Colour Vision Test — Frequently Asked Questions
What is a good colour vision score?
Most people reach somewhere between level twelve and eighteen. Beyond that the differences are approaching the limits of typical screens as much as typical eyes.
Is this a real colour blindness test?
No, and it should not be treated as one. This measures sensitivity to small differences in lightness within a single hue. Diagnosing colour vision deficiency requires a proper clinical test such as Ishihara plates, administered under controlled conditions. If you have concerns about your colour vision, see an optometrist.
Why does my screen matter so much?
Because the test depends on very small differences in shade, and those are exactly what a dim screen, a blue-light filter, or a low-quality panel destroys. Take it at full brightness with night mode off if you want a meaningful number.
Does the grid keep growing?
It grows every couple of levels up to six by six, then stops. After that, only the colour difference continues to shrink.
Why does the colour change each level?
The base hue is randomised so you cannot carry an expectation between rounds. It also stops the test becoming a measure of sensitivity to one particular colour.
Does age affect this?
Somewhat. Colour discrimination declines gradually with age, and lens yellowing shifts sensitivity across the spectrum. Screen and lighting conditions usually make a larger difference than age does.
Game Specifications
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