Paint by numbers
Paint by numbers, also known as Japanese puzzles or nonograms, are logic puzzles in which cells in a grid have to be coloured (or left blank) according to numbers given at the side of the grid to reveal a hidden picture.
These puzzles are often black and white but can also have some colours.
Paint by numbers is also a children's activity, similar in concept to the more complex logic puzzle. A black on white line drawing contains several fully enclosed areas, each marked with a number. Each number corresponds to a certain color of paint, often provided in a set along with multiple drawings. By following the number schema, the drawing is appropriately colored.