Completely infuriating, yet somehow fun; while being a complete and utter waste of life, a day without Sudoku (pronounced 'sod-oo-koh', or 'su-koh-do', or something like that), 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 'SHITEDOKU', as does each 9-square box - and, just like Sudoku, Shitedoku will tax and infuriate the keenest player. Yet in this original, pure version, the mystical significance of the puzzle - that all such exercises are essentially shite - can once again be revealed.