2026 Calcudoku Challenge: 365 Progressive Logic Puzzles (7×7 Grid): Daily Math-Based Puzzle Book with Gradual Difficulty Levels – Compact 6×9 Format with Solutions

2026 Calcudoku Challenge: 365 Progressive Logic Puzzles (7×7 Grid): Daily Math-Based Puzzle Book with Gradual Difficulty Levels – Compact 6×9 Format with Solutions

Independently published

Pages: 216, Paperback, Independently published

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