Item Type: Math Puzzle Board Game Material: Plastic Board Size: Approx. 25 x 23.5 x 1.2cm / 9.8 x 9.3 x 0.5in Package List 1 x Board 9 x Accessories 1 x Manual 1Math Learning: Math brain teaser desktop toy helps to strength basic math skills at all ages, effectively keeping kids focusing attention. 2Package Include: Come with 81 chess pieces, and 9x9 grids game board, which is the best toy for brain training and math learning. 3Improve Skills: Math brain teaser board toy can improve communication, patience, sharing, and interaction skills, which can bring endless fun. 4Promote Relationship: Number brain teaser board toy also suitable for adults to play, kids can play with parents, greatly increase the bond between them. 5Ideal Gift: Math brain teaser puzzle made of plastic material, safe and sturdy, which is the best birthday, Christmas, Halloween gift for children, suitable for kids over 3 years old.