Black belt crosswords (BOK)
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This book comes from puzzle sensei Rich Norris, one of the most prolific authors of the New York Times crosswords in the last 20 years. It includes 300 super-tough puzzles. You can expect to flex your mental muscles to the utmost! If you can complete these mind-meltingly tough conundrums, you're a true crossword expert and a solver of the highest skill.