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Logic puzzles book. Jigsaw Killer and Challenging Calcudoku sudoku.: Medium - hard levels. (Sudoku and large size puzzles): Holmes, Basford: 9781087041759: Amazon.com: Books
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Adult puzzles. Big Samurai and Calcudoku 9x9 Sudoku. Hard - extreme levels.: Very large font. (Sudoku and large size puzzles): Holmes, Basford: 9781078462143: Amazon.com: Books
1,000 + Calcudoku sudoku 9x9: Logic puzzles hard - extreme levels (Sudoku CalcuDoku): Holmes, Basford: 9781652712480: Amazon.com: Books
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