The Ultimate Challenge Sudoku Puzzle Book Grab this massive bargain bonanza of classic Sudoku puzzles of varying difficulty levels, expertly crafted and graded.

Our skill levels are accurate (we worked hard at this)!Bigger print than in most newspapers and magazines (and with better paper).Wide inner margins make it eas

Sudoku is the new number puzzle craze sweeping the nation, and Sudoku X is the only puzzle collection to add diagonal play to the Sudoku formula.

Also the puzzle may contain the regions of random (irregular) shape; this variant is called Jigsaw Sudoku