About the game

Inkwell Sudoku is the classic 9×9 number puzzle as it feels on paper: a thick cream card on a sunlit oak desk, crisp printed numbers and your own numbers in fountain-pen ink. Fill every row, column and 3×3 box with the numbers 1 to 9, jot candidates with the pencil, and undo freely.

Five difficulties, from Easy to Master, come from the hardest technique a puzzle needs, not from guesswork. A hint shows the next logical step and names the technique, from hidden singles to X-Wing and Swordfish, and mistakes never end the game: there are no lives and no energy.

Every puzzle was checked by computer: exactly one solution, solvable with logic alone, and you can verify it on your phone. The Daily Puzzle gives everyone the same puzzle each day, with three daily missions, a streak to keep and desks and inks to collect. No forced ads, no purchases.

Genre: Puzzle
Platform: Android 12 or newer
Price: Free, no in-app purchases
Ads: Only when you choose to watch one
Languages: English, Türkçe, Deutsch, Español, Français, Português (Brasil), Italiano, Русский, 日本語, 한국어
Internet: Not needed to play; used only for the optional ads
Developer: Alper Akar

How it plays

HOW TO PLAY

Fill every empty square with a number from 1 to 9
Each row, each column and each 3×3 box must contain every number exactly once
Tap a square, then a number; tap the same number again to erase it
Turn on Notes (the pencil) to jot down candidates in small writing

FIVE DIFFICULTIES, EASY TO MASTER

Easy, Medium, Hard, Expert and Master. Difficulty comes from the hardest technique a puzzle needs, not from guesswork: singles for Easy and Medium, locked candidates and pairs for Hard, triples, X-Wing and XY-Wing for Expert, Swordfish and XYZ-Wing for Master. Thousands of puzzles at every level.

HINTS THAT TEACH

A hint shows the next logical step and names the technique, with the squares that matter highlighted, so you learn as you play. Every puzzle comes with three free hints. Made a mistake? The hint finds it first.

NO GAME OVER

Mistakes never end the game and there are no lives or energy. A wrong number simply turns red (or stays hidden, if you prefer) and lowers your score a little. Undo is free and unlimited.

FAIR BY DESIGN

Every puzzle was checked by computer before it reached you: exactly one solution, solvable step by step with logic alone. Tap "Verify" in "How is it fair?" and your phone counts the solutions again. The game never changes the difficulty behind your back.

THE DAILY PUZZLE

One puzzle for everyone each day: easiest on Monday, hardest on Saturday. Solve it to grow your streak, and solve it again for a better score.

COMFORTABLE FOR EVERY PLAYER

Large numbers, highlighted rows, columns, boxes and matching numbers, auto-clearing notes, a "fill in all notes" option, handwritten or printed numbers, timer on or off. Plays offline, no Wi-Fi needed, in ten languages.

A REASON TO COME BACK

Three daily missions, easy, medium and hard, plus a bonus for finishing all three
Three stars for a perfect solve, best times for every difficulty and detailed statistics
Levels and XP
Desks and inks that unlock as you play: Library, Garden Table, Rainy Window, Winter Cabin, Midnight Lamp; Jet Black, Burgundy, Emerald, Sepia, Violet, Teal, Antique Gold
Halloween, October 23 – November 3: solve a puzzle and keep the Harvest Evening desk and the Pumpkin ink forever
At most one reminder a day, and only if you want it

Screenshots

A Medium puzzle in progress on cream paper: printed given numbers, handwritten blue ink numbers, small pencil notes, the selected square with its row, column and box highlighted, and the number keys below — CLASSIC SUDOKU **PAPER, INK AND CALM**

A hint on an Expert puzzle: the panel names the technique, XY-Wing, explains it in one sentence and highlights the squares that matter, with a Write it in button — HINTS THAT TEACH **EVERY TECHNIQUE BY NAME**

A solved puzzle: two of three stars, the score with its time bonus and mistake breakdown, the hardest step and the XP earned — SOLVE IT **EARN THREE STARS**

The desk collection: Morning Oak, Library, Garden Table and Rainy Window, with a 24-hour trial for the locked ones — MAKE IT YOURS **DESKS AND INKS**

Frequently asked questions

Is Inkwell Sudoku free?

Yes, Inkwell Sudoku is free and has no in-app purchases. Ads play only when you choose one: three more hints, double XP after a solve, saving a broken streak, swapping a daily mission, or trying a desk or ink for 24 hours. No banners, no interstitials, no in-app purchases. Free to play.

Does everyone get the same puzzles?

One puzzle for everyone each day: easiest on Monday, hardest on Saturday. Solve it to grow your streak, and solve it again for a better score.

Can I play Inkwell Sudoku offline?

Plays offline, no Wi-Fi needed, in ten languages.

Which Android version do I need?

You need Android 12 or newer.

Which languages is Inkwell Sudoku available in?

English, Türkçe, Deutsch, Español, Français, Português (Brasil), Italiano, Русский, 日本語, 한국어.

Where is my progress saved?

Your level, XP, statistics, daily missions, daily streak, Daily Puzzle scores, unlocked desks and inks, the puzzle in progress and your settings (such as language, sound, reminders and number display) are saved inside the app on your own device. We cannot see it. Uninstalling the game or clearing its data deletes it.