Sudoku - Brain Puzzles

The only Sudoku app with 18 variants in one place — Classic, Killer, Sandwich, Jigsaw, Kropki, Thermo, Arrow, Fog of War, Little Killer, Diagonal, and more — now with Chord Mode: every digit plays a piano note, and your solve ends with a cadence you can share. Whether you are a beginner or a seasoned player, enjoy a clean, ad-light experience with smart hints and a full built-in technique library to sharpen your skills.

◆ CHORD MODE — HEAR YOUR SOLVE ◆

Every correct digit plays a pitched piano note. Wrong digits sound off-pitch — a subtle audio cue that feels natural, not punishing. Complete a 3×3 box and hear a triad. Solve the grid and finish with a full I–IV–V–I cadence.
- Choose a key: C major, A minor, or C pentatonic
- Headphones-only option keeps notes private in public
- Mixes with background music and podcasts
- Share your solve as a short video with the cadence baked in

Works in every variant, including Mega 16×16.

◆ 18 SUDOKU VARIANTS — ALL IN ONE APP

Free:
- Classic 9×9 Sudoku (Easy, Medium, Hard)
- Little Killer 4×4 Sudoku
- Mini 6×6 Classic Sudoku
- Mini 6×6 Sandwich Sudoku
- Mini 6×6 Jigsaw Sudoku
- Mini 6×6 Kropki Sudoku
- Mini 6×6 Thermo Sudoku
- Mini 6×6 Arrow Sudoku
- Mini 6×6 Fog of War

Premium:
- Killer Sudoku with cage sums
- Diagonal Sudoku
- Sandwich Sudoku 9×9
- Jigsaw Sudoku 9×9
- Kropki Sudoku 9×9
- Thermo Sudoku 9×9
- Arrow Sudoku 9×9
- Fog of War 9×9
- Mega 16×16 puzzles

◆ HINTS THAT TEACH, NOT JUST TELL
Unlike other apps, our Smart Hints explain the logic behind each step:
"Row 3 already has 1, 4, 5 — and the cage sum requires 9, so this cell must be 9."
Perfect for learning Sudoku strategies as you play.

◆ 31 SOLVING TECHNIQUES — LEARN AND PRACTICE
From Naked Singles to 3D Medusa and Forcing Chains, the built-in Techniques section covers 31 strategies with clear explanations, visual boards, and practice puzzles. Each technique includes a dedicated "How to Find" guide and SE difficulty rating so you always know where to start.

◆ POWERFUL BOARD TOOLS
- Auto Candidates: fill in all pencil marks instantly with one tap
- Color cages & regions: tint Killer cages and Jigsaw regions for easier reading
- Draw Mode: annotate your board with boxes, circles, and chain marks to map out your logic
- Long-press any candidate for quick inline editing
- Undo, notes, and auto-save

◆ DAILY CHALLENGES
New puzzle every day at midnight, rotating through different variants each week. Build your winning streak and track progress on the calendar.

◆ BEAUTIFUL THEMES
5 app color themes: Classic, Cozy, Ocean, Sunset, Forest
4 symbol styles: Classic, Fruity, Ocean, Geometry
Light and Dark mode support

◆ TRACK YOUR PROGRESS
Detailed statistics by difficulty
Best times and win rates
Achievements to unlock
Game Center leaderboards

◆ SEAMLESS EXPERIENCE
iCloud sync across all devices
In-app language switching (no restart required)
Print puzzles directly from the home screen (Pro)
Compact and efficient — respects your storage

Available in English, German, French, Spanish, Japanese, Simplified & Traditional Chinese, Portuguese, Italian, Korean, Arabic, and Russian.

Subscription info:
Payment will be charged to your Apple ID account at confirmation of purchase.
Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period.
Your account will be charged for renewal within 24 hours prior to the end of the current period.
You can manage and cancel subscriptions in your App Store account settings.

Terms of Use (EULA): https://sudokubrain.app/terms-of-service.html
Privacy Policy: https://sudokubrain.app/privacy-policy.html