Puzzles are designed so that there is only one correct way to fill in the 81 squares, and they tend to be just hard enough to be satisfying: not too easy, not impossible. The rules of Sudoku are simple: finish filling in the squares of a 9x9 grid so that the digits 1-9 appear exactly once in each of the nine rows, columns, and 3x3 blocks. Have you ever played Sudoku? A few months ago my dad raved about a new game in the newspaper that he liked solving better than the daily crossword, and so I picked up one of the five hundred or so Sudoku books at the bookstore. Update: For Google Chrome users, try installing this Chrome Sudoku Web App for hints and more. It is a nice example of the website fun you can have with 250 lines of Python over a Labor day weekend it also makes a handy command-line Sudoku solver. Here is a free Sudoku generator that can generate puzzles of varying difficulty in PDF, Postscript, plaintext, and HTML.
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