Number sorting

Digital sorting, classic puzzle type number game. The goal of the game is to rearrange the number boxes on the board in the order of the smallest number of steps from left to right and top to bottom.
feature:
1. Challenge the speed of your brain and hands;
2. Move the number box in the game so that all the numbers are arranged in numerical order;
3. Challenge yourself with different difficulties;
4. Train your brain anytime, anywhere through the game;