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.