Disclaimer. Screen size and lighting strongly affect this activity. It is for fun and practice only. Full disclaimer

Spot the Difference Challenge

Find every change between two scenes.

A free spot the difference challenge with original scenes. Tap every place where the right picture differs from the left. Your score counts the changes you find; wrong taps are recorded but not penalised.

Choose a level to startEntryStart here1 starter scene with 6 changes, up to 3 minutes.Regular20 original scenes, each with 3 clear changes, 45 seconds per scene.Hard20 busier original scenes, each with 3 smaller but still clearly visible changes, 45 seconds per scene.

Start testUp to 3 minutes · demo and practice first

What it measures

How many changed regions you find between two otherwise identical scenes, and how long it takes.

DurationUp to 3 minutes

Format1 starter scene with 6 changes

Device and setupLarger screens make this easier. Mouse or touch.

Accessibility limitsRequires detailed visual comparison. A keyboard region mode is planned but not yet available.

Free resultChanges found out of 6 and elapsed time

PrivacyYour answers are never sent to advertisers. Signed in, your results are saved to your account.

How the score works

Each changed region counts once. Wrong taps are recorded but not penalised. Elapsed time is shown alongside.

Worked example

If a scene has 6 changes and you find 5 in 2 minutes 10 seconds with 3 wrong taps, your result is 5 / 6 changes in 2:10. The wrong taps appear in your details but do not lower the score.

Entry, Regular and Hard

Entry: 1 starter scene with 6 changes, up to 3 minutes.
Regular: 20 original scenes, each with 3 clear changes, 45 seconds per scene.
Hard: 20 busier original scenes, each with 3 smaller but still clearly visible changes, 45 seconds per scene.

Each level has its own fixed set of items and its own score, so results are only compared within the same level. How levels are designed

What Premium adds

Your basic score is always free. Premium adds: Scene accuracy and miss map. It also keeps your full history on every device and removes the ads. One upgrade covers all ten tests. See Premium

Limits

Screen size and lighting strongly affect this activity. It is for fun and practice only.

For education, entertainment and general self-exploration only. These activities are not medical or psychological assessments and do not diagnose, prevent or treat any condition. Results are estimates of performance on these tasks and can be affected by practice, attention, language, your device and your surroundings. If you have concerns about your thinking, vision or hearing, consult a qualified healthcare professional.

Questions

Are the scenes original?

Yes. Every scene is generated by ChowChow Labs from simple shapes, so nothing is copied from other puzzle books or sites.

Is a bigger screen easier?

Usually. Changes are easier to see on a larger screen, so compare your own results on the same device.

Do wrong taps count against me?

No. They are recorded so you can review them, but your score is only the number of changes found.

More in Speed and attention · Compare all ten tests

Made and maintained by ChowChow Labs. Content last reviewed October 23, 2026. Methodology and changelog · Report a problem