Inside this beautifully designed collection you will find 300 entertaining number-placement puzzles across by five increasing levels of difficulty so there is something for every ability of solver. With a travel inspired cover you can dream of far-off places or take it with you on your adventures for puzzling anywhere! 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. Solutions in the back: Check your answers in the solutions on back.