400 Extreme Calcudoku Puzzle Book - Ultimate 9x9 Mathdoku Challenges for Puzzle Masters: Very Hard Brain Teasers for Adults with 2 Puzzles per Page

400 Extreme Calcudoku Puzzle Book - Ultimate 9x9 Mathdoku Challenges for Puzzle Masters: Very Hard Brain Teasers for Adults with 2 Puzzles per Page

Independently published

Pages: 236, Paperback, Independently published

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