ECO-FRIENDLY - Work a soduko puzzle step-by-step, without leaving a footprint. This seet is made of eco-friendly bamboo so you can clear your conscience and focus on the challenge in front of you. SOLID WOOD PUZZLE - this sudoku set is constructed from solid wood, making this a high quality item for anyone looking for wood gifts for women or wood gifts for men. GREAT REPLAYABILITY - Use this sudoku set with the puzzles that we provide in the booklet and with others you find in books and magazlnes.