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PR: 6 | Math games - http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html Sudoku variation with explanation |
PR: 4 | Toplog - http://sudoku.toplog.nl/ Weblog featuring several sudoku variants |
PR: 4 | Killer sudokus explained - http://www.ndorward.com/blog/?page_id=50 |
N/A | Sumarai sudoku - http://sudoku.10e.net/ Play the samurai version online |