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Go way beyond difficult, with the hardest, most brain-busting sudoku you've ever seen! Calling all sudoku-solving diehards: with every puzzle requiring upper-level strategies, …
Math meets sudoku in this fun, challenging puzzle craze from Japan. Ready for step two? These KenKen offer a challenge that intermediate solvers will enjoy. KenKen is a grid-based …
Math meets sudoku in this fun, challenging puzzle craze from Japan. KenKen is a grid-based numerical puzzle that uses basic math operations—addition, subtraction, multiplication, …
Math meets sudoku in this fun, challenging puzzle craze from Japan. KenKen is a grid-based numerical puzzle that uses basic math operations—addition, subtraction, multiplication, …