One Spot: Odd Color Out Game

A crowd of animals, all the same color. Except one. Spot it before the clock runs out.

10 rounds · up to 1000 points

Pick a difficulty

How to play

Choose easy (5×5), medium (10×10) or hard (20×20).
Find the one animal whose color is different and tap it. With a keyboard, use the arrow keys and Enter.
Be quick: each find is worth 60 points plus up to 40 for the time you have left.
Can’t see a difference? Press “Skip round” to move on. A skipped round scores no points.
After 10 rounds you get your score out of 1000. One tap per round, so look before you tap.

Why the odd one is hard to see with color blindness

The two colors in each round are picked the same way as the dots in our test plates. They differ only in the signal of one of the eye’s three cone types: red-sensitive, green-sensitive or blue-sensitive. With typical color vision that reads as a clear change in hue. If that cone type is missing, both colors produce the same signal and the odd animal blends in. If it is weaker, the difference is still there but fainter.

Each animal is also made slightly lighter or darker at random, so brightness alone won’t give the odd one away. Later rounds use a smaller color difference than early ones.

It’s a game, not a test

A low score doesn’t mean you are color blind, and a high score doesn’t rule it out. Screen quality, brightness, night mode and how fast you tap all change the result. To screen your color vision, take thecolor blind test, or the kids version for children. To see what the colors look like with each type of color blindness, try thesimulator.

Frequently asked questions

How do you play One Spot?

Pick a difficulty, then tap the one animal that has a different color from all the others. A game is 10 rounds. Each round is timed, and the color difference gets smaller as you go.

How is the score worked out?

Every animal you find is worth 60 points plus up to 40 more for speed, so a perfect game is 1000 points. A wrong tap, a skipped round or running out of time scores nothing for that round.

Why is One Spot hard with color blindness?

In each round the odd animal differs from the others only in the signal of one cone type. If that cone type is missing, the two colors look the same. If it is weaker, the difference is fainter. Eight rounds use red-green differences and two use blue-yellow.

Can One Spot tell me if I’m color blind?

No. It is a game. Your screen, its brightness, the room lighting and plain speed all change the score. If you keep missing rounds, the free color blind test on this site is the better next step, and an eye care professional can give a diagnosis.

What do the difficulty levels change?

The number of animals. Easy is a 5×5 grid (25 animals), medium is 10×10 (100) and hard is 20×20 (400). Bigger grids give you more time per round.

Color vision tests

Color blind testFull screening: red-green and blue-yellow, with type and severity.Red-green color blind testDeeper check for protan and deutan types.Tritanopia testBlue-yellow (tritan) color vision screening.Color blind test for kidsShapes instead of numbers, for children who can’t read digits yet.Reverse color blind testHidden-figure plates that color blind people can see more easily.Color blind simulatorSee any photo the way people with color blindness see it.