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Pages: 142, Paperback, Independently published
Independently Published
Number Pyramid Challenge: 200 Addition and Subtraction Brain Puzzles
Ultimate Grid Sum Challenge: 200 Hard Puzzles (Grid Number Puzzles)
Suguru Puzzle Book for Adults 1000 Hard 12x12 Tectonic Puzzles (Number Blocks...
M. Schottenbauer, Ph.D.
What's Missing?: Number & Operator Puzzles
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