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Web Sudoku is an online sudoku website which was rated as one of the best 50 fun and games website by Time. [1] It was founded by Gideon Greenspan and Rachel Lee. [ 2 ] The website was rated as the 7265th best website in the world by Jonathan Harchick in his book The World's Best Websites . [ 3 ]
A Sudoku puzzle can be expressed as a graph coloring problem. [27] The aim is to construct a 9-coloring of a particular graph, given a partial 9-coloring. The fewest clues possible for a proper Sudoku is 17. [28] Tens of thousands of distinct Sudoku puzzles have only 17 clues. [29]
Jigsaw puzzles have been used in research studies to study cognitive abilities such as mental rotation visuospatial ability in young children. Typical images on jigsaw puzzles include scenes from nature, buildings, and repetitive designs. Castles and mountains are among traditional subjects, but any picture can be used.