This super collection contains an amazing 500 sudokus graded from beginner to expert. Focus your mind and put your logical thinking to the test as you work through these satisfying puzzles. All numbers are in easy-to-read, large-print type for enjoyable solving. • EASY-TO-READ PUZZLES AND SOLUTIONS: Large-print type with plenty of space around the puzzles means that you won't strain your eyes as you solve them. • IMPROVE YOUR SOLVING SKILL: Each puzzle is graded, from beginner to expert, so you can enjoy the satisfaction of seeing your skill improve as you work through the levels. • EXERCISE YOUR BRAIN: Give your mind a great workout as you find where each missing number fits. • REDUCE STRESS: Feel your stress melt away as you focus on these satisfying puzzles. ABOUT THE SERIES: Put your puzzle-solving skills to the test with the Ultimate Puzzle Challenge series. These puzzle books contain anywhere between 500 and 1000 puzzles to keep you entertained for hours on end.