JIG: "For the uninitiated, picross puzzles are logic puzzles where you fill in squares on a grid to form a picture. Numbers line the top and left sides of the grid, each indicating a number of blocks to fill. What they don't tell you, however, is how many empty spaces there are. For example, if a row says "2 3 1", you know there are two blocks that need to be filled in, followed by at least once space, followed by three more filled blocks, followed by a single filled square. By using logic you can gradually narrow down the possibilities until each segment is a certainty."