Nonograms are logic puzzles that originate in Japan. In spite of
what you might have read elsewhere, and as far as I know, Nonograms
came into existence in 1987 — hardly
ancient, unless you're
reading this in 3001!
A Nonogram consists of a series of numbers that can be used to determine a picture. The puzzle comes from building this picture from the numbers, but it's important to understand how the numbers were derived from the picture in order to complete the puzzle.