Same grid. Who will be the best?
With SudoKoum, you challenge friends and family online on the same grid. Everyone plays it whenever they like, then the leaderboard settles it. There are no ads at all, and the app is paid for once, with no subscription.
Try SudoKoum before you buy, friend challenges included. A single €3.99 purchase lets you go Premium for life, with no subscription. One email only, on launch day.
SudoKoum home screen: Challenge a friend card, daily quest and five solo difficulties
A hard sudoku game in progress in SudoKoum, with timer, score and mistake counter
Playable demo. Tap a cell, then a number.
“For two years, I watched my family and friends print out Sudoku grids to challenge one another.”
Solo too, anywhere
Grids generated on demand, a score that rewards pace and streaks, and five difficulties that multiply your points. All of it works fully offline, on a plane or at the bottom of the garden.
Offline
Solo
100 achievements to unlock
Progress that keeps you coming back
100 achievements to unlock, each one a badge, from your first flawless grid to feats only the most stubborn will ever see. A daily quest awaits you, with its own leaderboard among friends. Climb the experience levels while detailed statistics track every step forward over three months, for each difficulty.
Your best time is not a number buried in a menu. It is a time you watch go down, game after game.
SudoKoum solo statistics: time progression over three months, best time and average
Built to last, translated for everyone
13 languages, to reach as many players around the world as possible. Light, dark or automatic theme. Optional timer, adjustable haptics, same-digit highlighting. It's SudoKoum that adapts to the way you play.
And your progress follows your account: switch phones and you get all of it back.
SudoKoum settings: 13 languages to choose from and light, dark or automatic theme
What no other Sudoku app combines
On a phone, Sudoku is mostly played alone, between one intrusive ad and the next, over and over again. SudoKoum brings together the three things players actually ask for.
| SudoKoum | Typical free apps | Premium solo apps | |
|---|---|---|---|
| Friend challenges and leaderboards | Yes | No | No |
| No ads at all | Yes | No | Yes |
| No subscription (one purchase, for life) | Yes | Often not | Yes |
| 100 achievements and detailed stats | Yes | Partial | Partial |
Detailed comparison, apps named. SudoKoum vs Sudoku.com and Brainium: social modes, real prices, ads. Verified July 2026.
The sudoku guides
“I created SudoKoum to bring back the joy of those shared grids, with no ads at all.”
Read the manifesto: why SudoKoum exists, and the four commitments we will not break.
Read the manifestoFrequently asked questions
Can you play Sudoku with friends on SudoKoum?
Yes, that is the heart of SudoKoum. You send a challenge to a friend, everyone plays the same grid and the leaderboard compares scores. Duel history and friend leaderboards are built in.
Does SudoKoum contain ads?
No. SudoKoum contains no advertising at all, neither before nor after you go Premium. That is a permanent commitment.
How much does SudoKoum cost?
Premium costs €3.99, once, with no subscription, for life. Before buying, you install the app and play solo without limits on Easy and Medium, daily quest included. You can also try playing with friends, with two challenges sent and two challenges received.
Do I need a subscription to play SudoKoum?
No. SudoKoum has no subscription. A single €3.99 purchase gives you everything, forever.
Can you play SudoKoum offline?
Yes. Solo mode works entirely without an internet connection.
Which platforms is SudoKoum available on?
SudoKoum is coming to iPhone and iPad (App Store) and Android (Google Play).
What does the one-time €3.99 purchase unlock?
Going Premium opens every difficulty, with Hard right away and then Expert and Extreme as you progress (levels 4 and 5). It also unlocks unlimited friend challenges and rematches, all 100 achievements, full statistics, the daily quest leaderboard and the full level progression. Once, for life, tied to your App Store or Google Play account. On a new device, the app's “Restore purchase” button brings it back.
Which languages is SudoKoum available in?
SudoKoum is translated into 13 languages, including English and French.
Be there at launch
SudoKoum is coming to the App Store and Google Play. Leave your email and get a single message, the day the app ships.
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The heart of SudoKoum
Nobody set a time. You still played together.
Your sister sends an Expert challenge to you and your best friend.
She sends it through whichever messaging app she likes. One tap on the link is all it takes for the three of you to play the same grid.
You play it over breakfast.
Everyone plays exactly the same grid, whenever suits them. The leaderboard compares like with like.
Your best friend plays it on their lunch break.
The challenge moves along through the day, everyone at their own pace.
Your sister finishes her game. The leaderboard is in.
Mistakes and hints count toward the score. Winning a SudoKoum challenge really means winning.
SudoKoum challenge leaderboard: the winner on top with score, time and mistakes
Leaderboard