Download or read book X-treme Sudoku written by Nikoli Publishing and published by Workman Publishing. This book was released on 2006-01-01 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: From Nikoli, the Japanese puzzle company that created the sudoku craze, comesa title that starts at hard and goes to a level of difficulty not seen in anyprevious books.