Sudoku Ninja: Classic & Killer

Sudoku Labs

Contains adsIn-app purchases

About this game

Play Classic and Killer Sudoku. Discover your Brain Score and watch it climb every week!

Enjoy a relaxing offline sudoku experience with 40,000 puzzles! Train your brain and sharpen your logic with daily challenges and logic puzzles for every skill level.

Whether you're a beginner or a pro, this sudoku puzzle game offers everything you need — from easy levels to expert challenges. Learn quickly, play smoothly, and master both Classic and Killer Sudoku at your own pace.

Take on daily sudoku challenges, sharpen your logic, and enjoy a refreshing take on brain training!

🧠 Brain Score (NEW!)
How sharp is your mind? Take a quick 7-minute brain test — pure visual logic, no math, no rules to memorize. Play daily for one week, then retake the test and watch your Brain Score climb. Track your progress across four skills: focus, speed, logic, and pattern recognition.

🌟 Relax & Train Your Brain
Enjoy a calm and satisfying sudoku experience with smooth gameplay, gentle animations, and a clean design that helps you focus. Perfect for both quick sessions and deep concentration.

🧩 Game Features
• 40,000 Sudoku Puzzles – Endless free sudoku content for beginners and experts
• Classic & Killer Sudoku Modes – Switch anytime between two popular logic puzzle styles
• 5 Difficulty Levels – Easy, Medium, Hard, Expert, and Invictus for true masters
• Daily Challenges – Play new puzzles every day and earn unique rewards
• Offline Play – Enjoy sudoku anywhere without internet
• Magic Pencil & Autofill Notes – Add and manage notes instantly
• Fast Input Mode – Optimized for experienced players
• Error Highlighting – Customize how you detect and fix mistakes
• Cloud Sync – Continue your game across devices
• Leaderboards – Compete with players worldwide
• Pick Any Puzzle – Pause and resume anytime

🥋 Sudoku Ninja Mode (NEW!)
Experiment freely like in a sandbox! In Ninja Mode, mistakes are not counted or shown — perfect for testing strategies and learning. Apply your changes to the grid when you're ready, or roll back to your last checkpoint anytime.

☕ Sudoku Coffee Mode
Set a time limit and challenge yourself! The harder it gets, the more bonus points you earn — perfect for quick, intense sessions.

🎨 Customization & Social Features
• Modern design with themes, colors, and fonts
• Share your progress with friends on social media
• Regular updates with new puzzles every week

Designed for all sudoku lovers — from casual players to hardcore puzzle solvers. Many puzzles are hand-crafted by the Sudoku Labs team to ensure a premium experience.

Download now and become a true Sudoku Ninja!

Ratings and reviews

7/26/25 Update is terrible. I got this game earlier this year-it was perfect: a prompt to take you to a game center when you open it, then nothing else intrusive....until now. Imagine playing your first puzzle in the morning and when you fill that last box, even before you can move your finger away, the screen changes and you are hit with an ad for some military game with crazy gunfire-set off my anxiety...what a shame. And no way to exit it until it plays through. Total fail on this update😒👎

Very well done sudoku app. After a certain period you do get an ad after every game, but all ads show a timer and skip. None are intrusive during gameplay or open a browser to scam antivirus products. This developer is at least holding some integrity and respect for their customers. $12 flat price to remove ads rather than other shady developers that charge a monthly fee. -- Edit: After some time I find the ad practice doesn't change. This company values its customers'wishes.

The app is very well layed out with many different game styles options and levels. It became a part of my morning routine. I initially used it to stop my morning mind wasting scroll. Then I got hooked on improving my score and rating. However, in the most recent update they removed the percentage rating which I used to measure my daily progress. Hence the 4 stars and not 5. Is there anyway this can be put back in, or is it a setting I have missed?

What’s new

New "Brain Score" logic added.
Thank you for playing Sudoku by Sudoku Labs!