100 Hard Calcudoku Puzzles for Adults: Challenging 6x6 Logic and Math Brain Puzzles | Advanced Calcudoku Puzzle Book for Adults (Hard Calcudoku Books)

100 Hard Calcudoku Puzzles for Adults: Challenging 6x6 Logic and Math Brain Puzzles | Advanced Calcudoku Puzzle Book for Adults (Hard Calcudoku Books)

Independently published

Pages: 120, Paperback, Independently published

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