Martial Arts Sudoku® Level 4: Green Belt Sudoku® (Martial Arts Puzzles Series)

Sudoku fever is on! Which book in the Martial Arts Sudoku series will provide the perfect challenge for you? The skill level recommended to solve these puzzles is ranked in the same way as Japanese karate levels—by different colored belts. If you’re not a beginner but not an expert either, try the Green Belt collection.