Samurai Sudoku Puzzle Book for Adults - Hard: 500 Difficult Sudoku Puzzles Overlapping into 100 Samurai Style (Paperback) | An Unlikely Story Bookstore & Café
Samurai Sudoku Book for Adults: Evaluate your level with 100 grids of 5 difficulty levels - Very easy - Easy - Medium - Hard - Fiendish and Diabolical | Indigo
Samurai Sudoku: 500 Hard Sudoku Puzzles Overlapping into 100 Samurai Style | Indigo