A rival that actually plays
A smart bot races you cell by cell, hesitates on the hard spots, and pushes back — fully offline, no waiting for anyone.
Free · No ads · No in-app purchases
Sudoku that finally feels alive
Skudo is a free, ad-free Sudoku app with Classic & Killer modes, a real-time AI rival that races you offline, daily challenges, a weekly league, and co-op play with friends.
Free · No ads · No sign-up required
- No ads
- No in-app purchases
- No sign-up needed
- Plays offline
Everything is in, nothing is sold
No ads. No IAP. No sign-up.
Everything is included, free. Open the app and play — sign in later only if you want to sync across devices.
Classic & Killer, Easy to Expert
Two modes in one app, four difficulty levels. Plus smaller 4×4 and 6×6 boards when you want to warm up.
Hints that teach, not tell
Smart Hints explain the exact technique behind the next move, so every game sharpens your logic.
Play with friends — versus or co-op
Create a private room, share the code, and go head-to-head — or team up in Co-op and solve one puzzle together.
Works 100% offline
Solo puzzles, bot matches, and hints all work without a connection. Your progress syncs when you are back online.
Progress you can see
A daily challenge to keep your streak, a 6-tier weekly league, XP, ranks and badges — not just a stopwatch.
Built to respect you
GDPR/PDPA compliant, VoiceOver & TalkBack support, dark mode, English and Vietnamese. Delete your account and data anytime.
Skudo in numbers
- 2game modes
- 3board sizes
- 6league tiers
- 0ads
How Skudo compares
| Feature | Skudo | Typical ad-supported Sudoku app |
|---|---|---|
| Ads | None | Usually banners + interstitials |
| In-app purchases | None | Usually a remove-ads tier |
| Classic + Killer in one app | Yes | Often two separate apps |
| Real-time AI rival, offline | Yes | Rare |
| Play with friends (private room, co-op) | Yes | Few apps have it |
| Daily challenge | Yes | Yes |
| Weekly league / ranking | Yes — 6 tiers | Varies by app |
| Hints that explain the technique | Yes | Some apps do |
| Offline play | Yes | Usually yes |
| Puzzle library & years in operation | Newer | Larger, longer-running |
| Community & number of reviews | Smaller | Much larger |
Comparison based on publicly documented features as of 2026-07-26. Other apps change — check their own pages for the latest.
Frequently asked questions
Is Skudo really free?
Yes — Skudo is completely free, with no ads and no in-app purchases. Every mode, every difficulty, and every feature is included. There is no premium tier.
Does Skudo have ads?
No. Skudo shows zero ads — no banners, no interstitials, no rewarded videos.
Can I play Skudo offline?
Yes — solo puzzles, bot matches, and hints all work fully offline in the downloaded app. Only multiplayer rooms and cross-device sync need a connection; your progress uploads automatically when you are back online.
Do I need an account to play?
No. You can open Skudo and start playing immediately. Sign in only if you want to sync progress across devices or join the weekly league.
Can I play Sudoku with friends in Skudo?
Yes — create a private room, share the code, and play head-to-head or in Co-op mode where you solve one puzzle together.
What is the AI rival?
It is a bot opponent that solves the same puzzle alongside you in real time, and it runs entirely on your device — no internet needed. It plays at a human-like pace: faster on easy cells, slower on hard ones, and it makes mistakes.
What is Killer Sudoku?
Killer Sudoku is Sudoku plus arithmetic: the grid is divided into dotted "cages", and the numbers in each cage must add up to the small sum printed in its corner — without repeating a digit inside the cage. Normal Sudoku rules still apply.
What board sizes does Skudo have?
Three: the standard 9×9, plus smaller 4×4 and 6×6 boards under "Easiest Sudoku" for warming up or learning. Easiest Sudoku is solo and offline only.
Do the hints just give me the answer?
No — Skudo hints explain the technique behind the next move, so you learn the reasoning instead of just filling a cell.
What is the weekly league?
Every week you are placed in a group and earn Weekly Points by playing; at the end of the week the top players are promoted and the bottom ones demoted across 6 tiers — Bronze, Silver, Gold, Platinum, Diamond and Master.
Is my data safe?
Yes — Skudo is GDPR/PDPA compliant, does not track your behaviour without consent, and lets you export or permanently delete your account and data at any time.
Start your streak today
Free, ad-free Sudoku with a live AI rival. Classic & Killer. Plays fully offline.