Features 1、Wooden Sudoku board can test children/u0027s observation and reasoning ability, improve their logical thinking ability, and stimulate children/u0027s interest in mathematics learning. 2、81-grid chessboard with 90 double-sided number blocks, you can try again and again, no need for pencil and paper or erase wrong numbers, it can be played anytime, anywhere. 3、Made of high-quality beech wood, the wood is tight and heavy, and has nice durability. The surface is painted with eco-friendly water-based paint, which is nontoxic and tasteless, so you can plays with confidence. 4、With drawer design, easy to store and carry. In order to avoids missing number blocks sometimes, we specially prepared a set of 9 spare blocks in the package. 5、Delivery includes a question book with 100 questions, you can assign questions based on it. Front is the question, back is the answer. 6、It can be a nice gift for friends, teenagers, children, etc. Parents can plays with their children and enhance parent-child interaction. Features: Wooden Sudoku board can test children's observation and reasoning ability, improve their logical thinking ability, and stimulate children's interest in mathematics learning. 81-grid chessboard with 90 double-sided number blocks, you can try again and again, no need for pencil and paper or erase wrong numbers, it can be played anytime, anywhere Made of high-quality beech wood, the wood is tight and heavy, and has nice durability. The surface is painted with eco-friendly water-based paint, which is nontoxic and tasteless, so you can plays with confidence. With drawer design, easy to store and carry. In order to avoids missing number blocks sometimes, we specially prepared a set of 9 spare blocks in the package. Delivery includes a question book with 100 questions, you can assign questions based on it. Front is the question, back is the answer. It can be a nice gift for friends, teenagers, children, etc. Parents can plays with their children and enhance parent-child interaction. Specifications: Color: Blue Material: Wood Item Size: 225 * 225 * 33mm/ 8.9 * 8.9 * 1.3in Package Size: 230 * 230 * 40mm/ 9.1 * 9.1 * 1.6in Package Weight: 600g/ 21.2oz Packing List: 1 * Sudoku Board Kit 1 * Question Book Package List 1 * Sudoku Board Kit 1 * Question Book