The Sudoku Challenge Book

A Sudoku addict's dream collection: hundreds of fantastic puzzles in a range of levels, some simple enough for a child to complete and other brain busting grids featuring the most fiendishly difficult, devilishly baffling Sudokus ever devised. Each unique puzzle is generated by hand, not computer, to give the player a more satisfying experience. Handy, pocket-size 5"x 7" book lets you play anywhere. Includes tutorials.