Completely infuriating, yet somehow fun, a day without Sudoku often leaves devotees feeling empty and incomplete. What few realize, though, is that Sudoku was adapted from the ancient Hungarian game of Shitedoku--a game of letters, not numbers. Each line of a Shitedoku puzzle must contain the letters of "SHITEDOKU," as does each 9-square box--and just like Sudoku, Shitedoku will tax and infuriate the keenest player.
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