One-time purchase
€5.99, paid once. Yours for good, with no recurring charges.
Out now on Android · iOS coming soon
DK Sudoku
A clean, ad-free Sudoku for people who actually want to think. No banner ads, no energy timers — just six difficulty tiers, graded by the logic each puzzle requires.
20 free puzzles
No ads, ever
Works offline
8 languages
Game board
Daily Challenge
Statistics
Dark mode
Home
Six tiers, real logic
Difficulty means something here.
Most Sudoku apps grade difficulty by clue count. DK Sudoku grades every puzzle by the solving logic it actually requires, so each step up the ladder asks more of you, not just a sparser grid.
01
Easy
A relaxed solve. The next move is always there to find.
02
Medium
Asks you to look a little further than one cell.
03
Hard
Where real pattern-spotting begins.
04
Expert
For experienced solvers who know their tools.
05
Master
Deep, patient logic across the whole grid.
06
Extreme
The hardest logic we grade. Earns its name.
Every puzzle is verified to have exactly one solution.
Built for actual solving
The tools serious solvers reach for.
01
Notes & pencil marks
Track candidates per cell without committing.
02
Step-by-step hints
Hints start subtle and escalate only as far as you ask.
03
A highlighting toolkit
Row, column and box, duplicates, identical numbers and mistake checking — each toggled independently.
04
Play it like paper
Turn off Auto-Check Mistakes and nothing gives away whether a number is right until the grid is full. Your score and mistakes are revealed at the end.
05
Daily Challenge & streaks
One shared puzzle a day, with a streak calendar.
06
Personal statistics
Best times, best scores and mistake-free streaks, overall and by tier.
07
Eight languages
English, Deutsch, Français, Español, Italiano, Português, 日本語 and 한국어.
Pricing
Try it free, then unlock it your way.
Play 20 puzzles free to try the whole app. After that, unlock everything your way. Both options unlock exactly the same app, with no ads either way.
Subscription
€1.49 every 3 months. Renews automatically until you cancel, which you can do any time in your store's subscription settings.
Prices may vary by country; the store shows your local price before you buy. See the Terms of Use for details, and Support for how to cancel or restore a purchase.