Young puzzlers can put their number and logic skills to the test with this ultimate book of over 180 sudoku puzzles.Inside you'll find puzzles for everyone, from sudoku beginners to number ninjas. They're graded by skill level so that you can start wherever you feel comfortable-then level up when you're ready for a challenge.With epic cartoon illustrations, this collection offers hours of fun and satisfaction while improving memory and critical thinking too! Fantastic fun for puzzlers aged 7+