Sudoku - Number Fun & Day Calm

「Sudoku」· A classic 9×9 logic puzzle for commute pockets. 「One grid at a time—turn spare minutes into clear thinking」 「Sudoku」 brings familiar 9×9 rules to a pocket session: tap a cell, enter 1–9, and make every row, column, and 3×3 box unique. Boards ship with a single solution. Five difficulties run Easy to Expert—free through Medium—and a free Daily Puzzle keeps a streak without eating your new-game quota. Notes, teaching hints, undo, and erase keep reasoning reversible; a timer, mistake limit, and pause-to-hide board protect focus. Auto-save, review, stats, and themes close the loop so a round can stop, continue, and be remembered. ——— Key Features ——— 1 Classic boards and difficulty rhythm · Standard 9×9 unique-solution boards: fill from the bottom number dock; digits that already appear nine times gray out. Same-puzzle Retry clears progress and restarts the timer without swapping…