Explainable help
Coach identifies a logical next move and shows the reason, so a hint can teach rather than simply reveal.
SudokuIQ
Play Free Sudoku Online
Play unlimited Easy, Medium, Hard and Expert Sudoku, solve today’s Daily challenge, try Killer Sudoku, or learn logical techniques in the SudokuIQ Academy.
7 difficulty levelsFresh Daily challengeGuided Coach and boostsContinue on another device
Live
Classic Sudoku
The polished SudokuIQ game with coach tools, boosts, themes, and device transfer.
Play nowToday
Daily Sudoku
A fresh dated challenge with a permanent page, shareable result, hints, and progress tracking.
Play nowLive
Killer Sudoku
Cage sums and deeper arithmetic logic for players who want the next climb.
Play nowLearning
Academy
Rules, solving techniques, examples, and practice links for players who want to improve.
Start learningChoose a level
Seven ways to challenge your logic
Every level has its own permanent page, clear purpose, and direct route into the playable board.
FastA short warm-up built around visible singles.EasyBeginner-friendly boards for learning scanning.MediumMore candidate work and occasional pairs.HardDeeper elimination without relying on guesses.ExpertMulti-step logic for experienced solvers.GiantSparse clues and a longer concentration session.DiabolicalThe strongest challenge in the SudokuIQ ladder.
Why SudokuIQ
A playable puzzle site with useful guidance
Continue anywhere
Create a temporary transfer code or QR link and resume a supported puzzle on another device.
Checked puzzles
Classic boards start from valid solved grids and are checked for a single solution before play.
Learning connected to play
Academy lessons link directly to suitable practice levels, from singles and scanning to pairs.
SudokuIQ is independently built and maintained by Chamara S. Kodikara. Read how puzzles and lessons are reviewed.
Android app
Prefer the phone app?
Install SudokuIQ for offline play, native mobile controls, coach tools, and boosts.
Player love
Reviews from SudokuIQ players
Curated Play Store feedback is shown here. New website reviews are verified with Google sign-in and kept pending until approved.
Independent puzzle app
Built by the creator of the Android app
SudokuIQ is operated by Chamara S. Kodikara. The web version is being developed to match the Android experience with clean play, coach tools, cross-device continuation, and responsible ad-supported features.