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Spot the Difference shows two nearly identical images and asks what changed. It is harder than it looks for a real reason: people are surprisingly bad at detecting changes between two views, an effect known as change blindness, and this game makes that limitation obvious.
Two similar images are shown.
Find the differences between them.
Click each difference as you find it.
Differences get subtler as rounds progress.
Your score combines differences found with time taken.
Change detection and systematic comparison. What improves is method — comparing region by region rather than hunting — not visual acuity. Another focus game to try next: Balloon Pop.
Compare region by region in a fixed order. Random hunting re-checks the same areas and misses others.
Look at edges and boundaries first. Changes there are more detectable than changes in a uniform area.
Defocus and flick between the two images. A change often pops out of a blurred comparison.
Check colours separately from shapes. They are different kinds of change and looking for both at once finds neither.
The well-documented failure to notice large changes between two views when the change happens during an interruption. It is one of the most striking findings in attention research.
Because you only encode a small part of a scene in detail. Anything outside your current focus is held in far less detail than it feels like.
It improves systematic comparison, which is the actual skill. It does not make you notice more in general.
Fixed-order region comparison. It is slower than hunting and it finds more.