SUDOKU Hard - Extreme 200 PUZZLES WITH SOLUTION: VERY LARGE PRINT (65pt font) - One Puzzle per page

Funster 1,000+ Sudoku Puzzles Easy to Hard: Sudoku puzzle book for adults

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The Man Who Counted: A Collection of Mathematical Adventures

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The Ultimate Logic Grid Puzzle Book for Adults, Volume 3: 100 Fun and Extra Challenging Puzzles for Advanced Solvers (Logic Puzzles - The Ultimate Collection)

The Complete Book of Origami Polyhedra: 64 Ingenious Geometric Paper Models (Learn Modular Origami from Japan's Leading Master!)