About this game
How sharp are your eyes for subtle shades? In this color sensitivity test, a grid of identical tiles hides one square that is slightly lighter than the rest. Tap it and a new, harder grid appears. You have 60 seconds, and every wrong tap costs you three. The grid grows from 2x2 up to 8x8, and the difference shrinks from an obvious jump in lightness to just a few percent, so it starts easy and gets genuinely sneaky.
Your score is the number of odd tiles you found, and it maps to an animal tier. At the bottom sits the Red-Cape Bull (cattle have only two kinds of color cones), then the Good Dog, the Certified Human with our three cone types, the surprisingly gifted Pigeon, which has a fourth cone type that reaches into near-ultraviolet light, the sharp-eyed Hawk, the Butterfly, and finally the legendary Mantis Shrimp. Most people land in the Human or Pigeon tiers on their first few tries.
Your result depends on more than your eyes. Screen brightness, night mode, blue-light filters, glare and display quality all change how different two shades look, which is why your score can jump when you switch devices. A good trick is to relax your gaze and look at the whole grid at once, letting your peripheral vision flag the odd tile.
One honest note: because the odd tile differs only in lightness, this game measures shade sensitivity, not color blindness. It is a quick, playful challenge, not an eye exam. If you are curious about your color vision, an optometrist can run proper tests.
How it works
- Press start and look for the one tile that is a slightly different shade.
- Tap it to advance. Wrong taps cost 3 seconds, so be quick but careful.
- When the 60 seconds run out, see your tile count, level and animal tier.
FAQ
Is this a color blindness test?
No. The odd tile differs only in lightness, so the game measures how well you notice small shade differences. Color blindness tests check how you tell specific hues apart, and a proper diagnosis comes from an eye care professional.
What is a good score?
Most people find somewhere around 14 to 25 tiles, which puts them in the Certified Human or Pigeon tiers. 26 or more is excellent, and 38 or more reaches the top Mantis Shrimp tier.
Why did I score differently on my phone and my computer?
Screens differ in brightness, contrast and color accuracy, and features like night mode or blue-light filters soften differences. Glare and viewing angle matter too. For a fair comparison, use the same device with brightness turned up.
Can mantis shrimp really see more colors than us?
They have around 12 types of color receptors versus our three, but a 2014 study in Science found they are actually poor at telling similar colors apart. In a game like this, a sharp-eyed human would likely win.
Is my score saved or shared?
Your game runs entirely in your browser and your results never leave your device unless you choose to share them. Recent results are kept only in your own browser.
For entertainment only. This is not a medical eye test or a color blindness test and cannot diagnose any condition. If you have concerns about your vision, see an optometrist or ophthalmologist.