History of Spot the Difference
A puzzle known from newspapers, children's magazines and puzzle books; when and where it first appeared is not reliably documented.
In print
Spot-the-difference puzzles are a familiar sight in newspapers, children's magazines and puzzle books. When and where the first one appeared could not be found in reliable sources; the dates given online contradict each other.
On PaperGames
The pictures here are put together anew for every game from twelve simple drawings, so a game never repeats. Patterns instead of shades of grey keep every difference clear on an e-ink screen.