Mr Toffee's Slow-Thermo Sudoku Puzzles

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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.  

A fun twist on regular Sudoku, great for those who love to hunt and whittle down pencil marks, Slow-Thermo is quick to pick-up, easily mastered, and highly addictive for the right kind of puzzle lover.  

This app includes a Sudoku conflict checker.

Platforms
Release date
Developer
Tom Fry
Publisher
Tom Fry
Age rating
Not rated

System requirements for Linux

Minimum:
  • OS: Ubuntu 20.04 LTS (or equivalent modern 64-bit distro)
  • Processor: 2-core 64-bit CPU
  • Memory: 4 GB RAM
  • Graphics: OpenGL 3.2 / Vulkan-capable GPU with up-to-date drivers
  • Storage: 500 MB available space
  • Additional Notes: Requires a distro with a recent glibc (Ubuntu 20.04 ships 2.31). Older distros may fail to launch with “GLIBC_x.y not found.”
Recommended:
  • OS: OS: Ubuntu 22.04 LTS
  • Processor: 4-core CPU
  • Memory: 8 GB RAM
  • Graphics: Recent integrated or discrete GPU
  • Storage: 1 GB available space

System requirements for macOS

Minimum:
  • OS: macOS 12 Monterey or newer (Intel or Apple silicon)
  • Processor: 2-core 64-bit CPU
  • Memory: 4 GB RAM
  • Graphics: Any GPU that supports Metal / OpenGL 3.2
  • Storage: 500 MB available space
  • Additional Notes: Built with Electron; unsigned app may require “Open Anyway” on first launch.
Recommended:
  • OS: macOS 13+ (Intel or Apple silicon)
  • Processor: 4-core CPU
  • Memory: 8 GB RAM
  • Graphics: Recent integrated or discrete GPU
  • Storage: 1 GB available space
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Last Modified: Oct 20, 2025

Where to buy

Steam