Here's a real treat for all fans of the number-placement puzzle sudoku: a collection of more than 500 grids arranged by level of difficulty. Sudokus are fun and satisfying to solve, and give our brains a good workout too. This compilation will satisfy even the most ardent enthusiast, and the beginner can enjoy the pleasure of working up through the levels as their solving skills improve. • OVER 500 PUZZLES AND SOLUTIONS: This bumper book of puzzles will provide many hours of entertainment. • EXERCISE YOUR BRAIN: These number placement puzzles will be sure to give your brain a stimulating workout. • IMPROVE YOUR SKILL: Enjoy the satisfaction of seeing your ability to solve the puzzles improve as you work through the five levels from beginner to expert.