打老鼠游戏，九个放个，有时间限制，速度会加快，比较简单。-Mice play games, take nine months, there are time constraints, faster, relatively simple.

Sudoku is a popular logic puzzle. The purpose of the game is to fill the 9 by 9 matrix with numbers 1 to 9 and meet the following constraints: 1. Each row has no duplicated numbers, 2. Each column has no duplicated numbers, 3. Each 3 by 3 subma