Best Sudoku Puzzle Books - Fun & Challenging Sudoku Variants for Adults - Perfect for Travel, Gifts & Brain Training

Its time to break out of the box: the traditional 3x3 puzzle box, that is! This assortment of engaging and challenging variants takes sudoku up a notch. The creative twists include overlapping and unusually shaped grids, special rules that make solvers up their game, and even super-large sudoku for an extra-fun experience.