About

What is this?

CipherHeart Sudoku is a free puzzle generator that turns any date, name, or message into a unique, personalised Sudoku. Instead of the numbers 1–9, your puzzle uses the symbols derived from your special sequence — making every grid one of a kind.

How it works

Enter up to 40 characters — digits, letters, or any mix. CipherHeart extracts up to 9 unique symbols from your sequence and fills the rest automatically. You then choose a path shape that determines where your sequence is placed on the 9×9 grid, and the app generates a valid Sudoku solution around it.

From the solution you can jump straight into puzzle mode and play it at Easy, Medium, or Hard difficulty — or share it as an image or link.

What it's for

CipherHeart is a fun, creative way to commemorate a special date, celebrate an anniversary, or send someone a puzzle with a hidden meaning. It's made purely for enjoyment — not a competitive Sudoku app.

Who made it

CipherHeart Sudoku is a ToccaTech side project. It is not affiliated with any institution or data provider.

Questions or feedback?

Head over to the Contact page or check the FAQ. You can also email us at [email protected].