About Sudoku.by
A free, multilingual Sudoku platform built for players of all skill levels - From first-timers tackling Easy to seasoned solvers pushing through Extreme.
Our Mission
Our mission is to build the best free Sudoku experience on the web - One that is fast, clean, and genuinely fun to play every day. We do not show intrusive ads. We do not sell your data. We do not lock features behind paywalls.
Great puzzle games should be accessible to everyone, everywhere. That principle drives every decision we make, from how difficulty levels are calibrated to how the interface is designed.
What We Offer
| Feature | Details |
|---|---|
| Classic Sudoku | Six difficulty levels: Easy, Medium, Hard, Expert, Master, Extreme |
| Killer Sudoku | Cage-based logic with arithmetic constraints, Easy through Expert |
| Daily Challenges | A new puzzle every day - Same puzzle for all players worldwide |
| Weekly Competitions | Ranked global contests with leaderboard recognition |
| Solving Techniques | 10 solving techniques from naked singles to X-Wing, explained step by step |
| Printable Sudoku | PDF-ready puzzles at any difficulty for offline play |
| Sudoku Solver | Instant solution finder for any valid Sudoku grid |
| 30+ Languages | Full language subdomains for players worldwide |
Who We Are
Sudoku.by is an independent project by Playpen Studios, a Hong Kong-based game development studio, and My First Games. We are a small team of puzzle enthusiasts and engineers passionate about making high-quality logic games accessible to everyone.
Every puzzle on the platform is generated algorithmically, verified to have exactly one unique solution, and solvable by pure logic - No guessing ever required. If you enjoy what we have built, sharing a puzzle with a friend is the best support you can give us.
Contact and Support
Have questions, feedback, or found a bug? Contact us here. Registered users can submit a support request directly from the dashboard for a faster response. We aim to reply within 24-48 hours.