The graded question bank is easy to understand and can be mastered and applied flexibly : starting from a simple four-square grid, gradually transitioning to a six-square grid and a nine-square grid, mastering problem-solving skills and strategies, and improving problem-solving ability. 4 major modes and 500 advanced questions, step-by-step, never tire of playing: one level after another, fun and interesting, cultivate children's self-confidence and enhance their sense of achievement. Intelligent Sudoku thinking game, surpassing the classic fun twice: classic Sudoku logical reasoning game, smart machine interactivity is stronger, real-time feedback improves practice efficiency, and brings children to enjoy the fun and challenges brought by Sudoku games. Color: White Material: plastic Package Contents: 1 x Sudoku(Without 3xAAA batteries,You need to prepare yourself) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.