Paint by numbers, also known as Japanese puzzles, nonograms, pic-a-pix, picross puzzles, pikurosu or griddlers, 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. The numbers measure how many unbroken lines of filled-in squares there are in any given row or column. ...
http://en.wikipedia.org/wiki/Griddlers...
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