Cell by Cell Sudoku

A sudoku that never just hands you the answer. It helps you solve every puzzle yourself, one cell at a time. No account and no ads. Plays offline. STEP-BY-STEP HINTS WHEN YOU’RE STUCK Choose where you want help (a cell, row, column or box) and the hint reveals one step at a time: where to look, why, then which digit. Nothing changes on the board until you tap Fill In, so you take only as much help as you want. 600 VERIFIED PUZZLES IN FOUR COURSES Easy, Medium, Hard and Very Hard, 150 puzzles each. Every puzzle has exactly one solution and can be solved with single candidates and hidden singles; harder courses give fewer clues and fewer open moves at a time. Earn up to three stars a puzzle (finish it, no mistakes, no hints), collect stars and medals in each course, and unlock Hard and Very Hard as you go. TODAY’S PUZZLE A new puzzle every day. Keep your streak going and fill the monthly calendar for bronze, silver and gold trophies. MY STATS A skill rating with six ranks from Novice to Grandmaster, a skill profile, records for each course and 13 achievements to earn. RANKINGS, IF YOU WANT THEM Join to see your rank on Today’s Puzzle (your time plus 30 seconds per hint), add up points in the weekly league from Monday, or open a room with a six-character invite code to compete with family and friends (up to 12). You play under an anonymous nickname made from a word list, with no sign-in. Rankings stay off until you join, and turning them off deletes everything you sent. YOUR OWN NOTES Write candidates in fixed spots inside each cell. Entering a digit can clear that note from its row, column and box (you can turn this off), and one undo brings back the digit and the notes together. MY PUZZLES: BRING YOUR OWN Type in a sudoku from a newspaper or book, or paste it as 81 digits. The app checks that it has exactly one solution, then saves it so you can solve it here. EASY ON THE EYES Three painted backgrounds (Paper, Garden and Night), light and dark appearance, large text support, sound effects and adjustable haptics. Works on iPhone and iPad, in English, Japanese and Korean. AUTOSAVE ON YOUR DEVICE Digits, notes and undo history save automatically, so you can pick up where you left off. Games, records and settings stay on your device. Only when you join rankings are your anonymous nickname and results sent. No account, no ads, no analytics. Hints use two techniques: single candidates and hidden singles. All 600 included puzzles can be solved with them. A puzzle you type in may need harder techniques; then some steps have no hint, and the app tells you so.