Sudoku by Sheepy Interactive is the top Sudoku puzzle game for your Android phone and tablet. Keep your mind active, or relax and pass the time. Just as good as the classic paper based puzzle Sudoku! Choose any level and challenge yourself. Tease your brain from easy level, and ready to have a brain workout with expert level. Our Sudoku puzzle game provides many features to help you solve the puzzle: auto-check, highlight duplicates, similar number highlight, track number usage, notes/pencil auto-update, and many more. You can also customize your Sudoku playing preferences for extra difficulty! Our Sudoku puzzle offer well-formed puzzles in classic 9x9 grid, each with only one solution. Features: ✔ 4 balanced level of difficulty (easy, medium, hard, expert) ✔ Pencil to take notes, just like on paper, and when you put a number, notes will automatically updated ! ✔ Pen hint, show the correct number in a cell ✔ Pencil hint, show all possible pencil notes, very helpful for beginner ! ✔ Board theme, adjust the appearance and play with more comfort ✔ Game statistics, track your game progress on each difficulty ✔ Auto-save, got to go or need to work on something else? Just switch off the app. Your progress is saved automatically! ✔ Undo, revert back your moves ✔ Switch pen color, put different pen color for your experiment ✔ Auto check and highlight on duplicates (configurable) ✔ Highlight on column, row, and box of your selected cell (configurable) ✔ Highlight on similar numbers that already on the board by select the number on any cell (configurable) ✔ Number usage indicator to track the count of each number already on board (configurable) ✔ Pencil auto update when number is placed on board (configurable) Download now and play Sudoku puzzle on your Android phone or tablet, anytime, anywhere !