Sudoku game plus

A good game to exercise your brain.Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called "boxes", "blocks", "regions", or "subsquares") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a unique solution.
This version uses a new UI design. And added a new feature:Hints. In each puzzle, you have three times to get hint.
Features:● Limit Hints● 3 difficulty levels● Auto-fill,and also you can shut this feature● Check errors● Clear notes● Auto-save
Have fun!