Sudoku - Brain Puzzles

The only Sudoku app with 27 variants in one place — Classic, Killer, Sandwich, Jigsaw, Kropki, Thermo, Arrow, Fog of War, Skyscraper, Anti-Knight, Windoku, Odd/Even, 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.

◆ 27 SUDOKU VARIANTS — ALL IN ONE APP

Free:
- Classic 9×9 Sudoku (Easy, Medium, Hard)
- Little Killer 4×4 Sudoku
- Mini 6×6: Classic, Sandwich, Jigsaw, Kropki, Thermo, Arrow, Fog of War, Anti-Knight, Windoku, Odd/Even, Skyscraper

Premium:
- Killer Sudoku with cage sums
- 9×9: Diagonal, Sandwich, Jigsaw, Kropki, Thermo, Arrow, Fog of War, Anti-Knight, Windoku, Odd/Even, Skyscraper, Column Indexer
- 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.