Planned Release Date: Oct 14, 2025

Known issue at launch — Saving:

Mr Toffee saves your progress when you Quit the game. Until our next update, please use Game Menu → Quit (or ⌘Q on Mac / Alt+F4 on Windows) to ensure your latest grid digits are saved. If you close the app via the Steam “Stop/Close” button, the OS may exit the game before it finishes writing a save.

We’re adding a visible Save & Quit button on the home screen and a “save-on-any-close” safeguard soon. Thanks for your patience while we polish this!

About This Game

Sudoku with an artsy twist.  Full-colour hand-crafted Sudoku-variant puzzles.  

Probably the prettiest puzzles in all of the world.

Slow-Thermo is an easily understood Sudoku variant that pushes digits into the grid.  

Slow-Thermo is quick to pick-up, easily mastered, and highly addictive for the right kind of puzzle lover.  

A fun twist on regular Sudoku, great for those who love to hunt and whittle down pencil marks.

This app includes a Sudoku conflict checker.

Temporary save note: For now, progress is written when you Quit the game (⌘Q on Mac / Quit from the game menu). Closing via the Steam “Stop/Close” button may not save immediately. A Save & Quit button is coming in an update.

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

We here at Toffee Co. used generative-AI tools during development to create artwork and write all the code. No content is generated while the game runs. All shipped assets were reviewed/edited by us; no real-person likenesses or third-party copyrighted IP are used.