form9Shape Sudoku
A calm, number-free sudoku. A quiet puzzle for the in-between moments — fully offline, no ads, no tracking.
- Daily Challenges
- No ads
- No tracking
- Play offline
How form9 works
Sudoku, stripped back to pure logic — no arithmetic, nothing to read but shapes.
-
One rule
Every row, every column and every 3×3 box holds all nine shapes exactly once. That is the whole game.
-
Scan, don’t count
There is no adding or counting. You spot where each shape can go — pure pattern recognition and deduction.
-
Fill the grid
Work shape by shape until the board is complete. Calm, unhurried, and quietly satisfying.
New to sudoku? Start with the beginner’s guide.
Learn to solve, step by step
A growing library of solving techniques, taught with shapes so the logic stays front and centre.
- Sudoku strategies The full hub — every technique from beginner scanning to advanced elimination.
- Easy techniques Scanning, naked singles and hidden singles — the moves that solve most puzzles.
- Medium techniques Naked and hidden pairs, pointing pairs, box/line reduction and triples.
- Benefits of visual sudoku What number-free sudoku trains — working memory, attention, pattern skill.
Or browse all our articles on visual sudoku.
Frequently asked questions
What is form9?
form9 is shape sudoku — classic sudoku played with nine shapes (circle, square, triangle, slash, diamond, star, plus, ring, heart) instead of the digits 1–9. Same logic, no numbers.
Is it the same as normal sudoku?
Yes. Sudoku involves no arithmetic, so swapping the digits for shapes changes nothing about the logic. Every technique works exactly the same — the shapes are just nine distinct tokens.
Do I need to be good at maths?
No. There is no counting, adding or numbers at all — only pattern and deduction. Many people who find numbers stressful find shape sudoku far more approachable.
Is form9 free?
Yes — free to download and play, with an optional one-time Pro unlock. No subscription, ever.
Does it work offline?
Completely. form9 needs no internet, shows no ads, and does no tracking — your puzzles and progress stay on your device.
Which devices can I play on?
form9 is on iPhone, iPad, and Android — free on the App Store and Google Play.
Release plan
In progress
- 1.1.0
Game Center
Leaderboards and achievements.
Planned
- 1.1.1
A special surprise ✨
Our lips are sealed — for now.
- 1.2.0
iPad support
form9 at home on the big screen.
…and more to come.