Printable Spot the Difference (Free PDF)
Two drawings of the same park, side by side on a landscape page, with a known number of changes in the picture on the right.
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Picture A and picture B show the same park: a house with windows and a door, three trees, a fence, flowers, clouds, birds, a kite, a bench, a pond and a ball. Picture B has been altered in eight or twelve places. Something is missing, something has moved, something has shrunk, or something has lost a window, a petal, a fence post or a ray of sunshine. A row of tick boxes under the pictures lets a solver count the finds off, one box per difference.
Both scenes come from one description of the park, which is drawn twice. The changes are applied to a copy of that description by a seeded generator, so the two pictures differ in exactly the places the key reports and nowhere else, and the count printed on the page is the real count. Nothing is drawn freehand, so the unchanged parts of the two scenes line up exactly and a difference is always a genuine difference rather than a wobble in the drawing.
The sheet is landscape so both pictures are large enough to compare at arm's length rather than squinting at two narrow columns. Page two repeats the pair with a red circle around every change in picture B, each circle sized to the thing it marks, so a parent can settle an argument without hunting. The line work is plain black on white and prints cheaply, and the tick boxes under the pictures make it easy to race two copies against each other.
