Paint by numbers puzzles were implemented by 1995 on hand held electronic toys such as Game Boy and on other plastic puzzle toys. Griddlers was the winning name that readers chose. The Sunday Telegraph ran a competition in 1998 to choose a new name for their puzzles. Nonograms were also published in Sweden, United States (originally by Games magazine), South Africa and other countries. The Sunday Telegraph published a dedicated puzzle book titled the "Book of Nonograms". By 1993, First book of Nonograms was published by Non Ishida in Japan. Subsequently in 1990, James Dalgety in the UK invented the name Nonograms after Non Ishida, and The Sunday Telegraph started publishing them on a weekly basis. Non Ishida published three picture grid puzzles in 1988 in Japan under the name of "Window Art Puzzles". Paint by numbers puzzles started appearing in Japanese puzzle magazines. Coincidentally, a professional Japanese puzzler named Tetsuya Nishio invented the same puzzles. In 1987, Non Ishida, a Japanese graphics editor, won a competition in Tokyo by designing grid pictures using skyscraper lights that were turned on or off. Nonograms are also known by many other names, including Paint by Numbers, Griddlers, Pic-a-Pix, Picross, PrismaPixels, Pixel Puzzles, Crucipixel, Edel, FigurePic, Hanjie, HeroGlyphix, Illust-Logic, Japanese Crosswords, Japanese Puzzles, Kare Karala!, Logic Art, Logic Square, Logicolor, Logik-Puzzles, Logimage, Oekaki Logic, Oekaki-Mate, Paint Logic, Picture Logic, Tsunamii, Paint by Sudoku and Binary Coloring Books. Nonograms have no theoretical limits on size, and are not restricted to square layouts. For example, a black four followed by a red two could mean four black boxes, some empty spaces, and two red boxes, or it could simply mean four black boxes followed immediately by two red ones. Two differently colored numbers may have a space in between them.
If colored, the number clues are also colored to indicate the color of the squares.
These puzzles are often black and white, describing a binary image, but they can also be colored.
For example, a clue of "4 8 3" would mean there are sets of four, eight, and three filled squares, in that order, with at least one blank square between successive groups. In this puzzle type, the numbers are a form of discrete tomography that measures how many unbroken lines of filled-in squares there are in any given row or column. Nonograms, also known as Hanjie, Picross or Griddlers, are picture logic puzzles in which cells in a grid must be colored or left blank according to numbers at the side of the grid to reveal a hidden picture. Some of the steps of the process are grouped together. Example of a nonogram puzzle being solved.
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