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Sudoku is one of the most popular pen-and-paper puzzles in the world. It’s found in numerous daily newspapers, puzzle books, and smartphone apps. After years of tackling regular Sudoku, Extreme Sudoku, Word Sudoku, Mega Sudoku, Samurai Sudoku, Geometric Sudoku, Sum-Doku, and numerous other variations, you’d think the puzzle community at large would’ve exhausted every possible version of Sudoku. Enter the crafty folks at ThinkFun, who have put a unique spin on another Sudoku variant… More