Rules of the game:
1. Numbers in rows 0-9 cannot be repeated
2. The numbers in columns 0-9 cannot be repeated
3. The number of small nine squares cannot be repeated
4. The game may be more than one solution, you need to be careful, serious step-by-step solution
Game features:
1. There are four themes for you to choose from: spring, summer, autumn and winter.
2. There are 8 levels for you to choose from: entry level, easy level, general level, primary level, medium level, difficult level, difficult level and master level.
Game skills:
1. Start by finding the smallest number of spaces in a row or column or a square, and look for numbers that dont repeat each other.
2. According to the position of the number in the nine squares, each nine square has and only appears the number once.
After the completion of the answer, there is a time. I hope you can have a good time while challenging yourself.