How to Play Spot the Difference
Spot the Difference presents two pictures side by side that look identical at a glance. Five small details have been changed in one of them. Tap each change on either image to mark it with a red circle, and find all five to clear the round.
There is no timer pressure forcing mistakes and no penalty for exploring. The whole game is careful looking, which makes it unusually relaxing for a puzzle — and unusually frustrating when a change is hiding in plain sight.
Controls
Tap or click any spot you think has changed, on either the original or the modified picture. Correct finds are circled. Use the Hint button if you are stuck.
Scan systematically, not randomly
The natural way to play is to let your eyes wander across both pictures hoping something jumps out. This works for the one or two obvious changes and then stalls completely.
The method that actually finds all five is systematic: divide each image into quarters and compare one quarter against its counterpart before moving to the next. It feels slower for the first thirty seconds and it is dramatically faster overall, because you never re-examine the same region three times while leaving another untouched.
Some players prefer strips to quarters — scanning left to right in horizontal bands. Either works. What matters is that the coverage is complete and you know which parts you have already done.
Check the edges first
Changes near the edges and corners are missed far more often than changes in the centre, and puzzle designers know this. Your attention naturally gravitates to the middle of an image and to the visually interesting subject, which leaves the background and the borders under-examined.
Starting at the edges and working inward inverts that bias and usually finds one or two differences immediately.
The four kinds of change
Almost every difference falls into one of four categories, and knowing them tells you what to look for:
- Something removed — an object present in one image and absent in the other
- Something added — an extra object that has no counterpart
- A colour change — same object, different shade
- A small move — the same object shifted slightly, or flipped
Removals and additions are the easiest to spot because they change the silhouette. Colour changes are the hardest, especially between similar shades, which is why they are often the last one you find.
Compare shapes before colours
Because outline changes are easier for human vision to detect than subtle colour shifts, an efficient first pass looks only at shapes and edges — treating the image almost as if it were a black-and-white line drawing. This catches additions, removals and moves quickly.
Then do a second pass specifically hunting colour, looking at large flat areas like sky, walls, clothing and water where a shade change can hide without altering any outline.
When you stall, look away
There is a genuine perceptual effect at work when you have stared at an image for a while: your visual system adapts and stops flagging detail in a scene it considers already processed. This is why a difference you could not find for two minutes becomes obvious immediately after a break.
If you are stuck, look away for five seconds, then return. It is faster than continuing to stare, and it is more reliable than any searching technique.
Good for eyes and attention
Spot the difference puzzles are used in vision therapy and cognitive exercises because they train sustained visual attention and systematic scanning — skills that are genuinely useful and genuinely trainable. They are also one of the few puzzle formats a young child and an adult can play together on equal footing, since raw observation does not depend much on experience.
Plays on any device
Spot the Difference runs in your browser using HTML5 and works on phones, tablets, laptops and desktops. Nothing to install and no signup required.
