Download or read book Hard Sudoku Books for Adults 400 Sudoku Puzzle for Digit Detectives written by Sudoku Books and published by Createspace Independent Publishing Platform. This book was released on 2017-12-08 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hard Sudoku Books for Adults 400 Sudoku Puzzles for Digit Detectives Sudoku Puzzle Books for Adults with Hard Puzzles