Sudoku
If you have never played Sudoku then prepare to become addicted.
The aim of the puzzle is to enter a numerical digit from 1 through 9 in each cell of a 9×9 grid made up of 3×3 subgrids (called “regions”), starting with various digits given in some cells (the “givens”). Each row, column, and region must contain only one instance of each numeral. Completing the puzzle requires patience and logical ability.
It is a pure logic game. You can see the complete rules here and a lengthier history at Wikipedia.
UPDATE: For all you geeks, here is some code for the “Shortest Sudoku Solver”.
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doug, once again you are the last to know. sodoku is already the national sport in like 9 countries.