Have fun and exercise your mind at the same time with Sudoku! Enjoy classic Sudoku with useful new features. With helpful tools and 4 difficulty levels, this is sure to become your favorite new pass time. Sudoku Features: - Four difficulties (easy, medium, hard, and expert) - Notes - Hint - Highlight incorrect values and duplicates - Automatically reveal potential notes - Player Statistics - Leaderboard and Achievements The objective is simple, fill the 9×9 grid with digits so that each column, row, and the nine 3×3 sub-grids contain every digit from 1 to 9. Sudoku is also known as 数独. Download this Sudoku app and play today for mind challenging fun! Download for free. Exercise your mind and have fun at the same time! High-Quality Puzzles.