| http://www.w3.org/ns/prov#value | - And, as with Vertical's previous collections, there are an array of Sudoku-inspired variant puzzles in Sudoku Hell, which offer unique new ways to entertain and drive puzzlers mad with pleasure.About the AuthorAccording to The Times of London, Tetsuya Nishio is the undisputed grand 'puzzle master' ofSudoku: a bespectacled fiend from the darkest suburbs of Tokyo who spends his every waking hour de
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