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  • "The World's Most Infectious Puzzle." The Week Magazine. http://theweekmagazine.com/article.aspx?id=1271
  • How to solve Su Doku: tips http://theory.tifr.res.in/~sgupta/sudoku/algo.html
  • Sudoku.com http://www.sudoku.com/
  • Sudoku Online: Home of the Sudokulist http://www.sudoku.org.uk/index.htm
  • Peterson, Ivars. "Sudoku Math." Science News Online. http://www.sciencenews.org/articles/20050618/mathtrek.asp