Funny Math:Four house Sudoku

Do you know Sudoku? If you like Sudoku, the most powerful Sudoku has come!
We have four and six cells mode for children, and,
From simple mode to medium mode, even to expert mode.
Exam are all randomly generated and never repeat! Even more crucially that is the only answer!
Come to download it! Lets start a Sudoku life!

Operating tips:
1. Choose a game mode, you can start from simple mode and progressively unlock.
2. Go to the game, choose a no digital space, and calculate the digital can be filled in this position.
3. After get the figure, click on the bottom row of the numeric button then enter the number.
4. You can also use the Notes and Tips feature to help solve problems.