Thermo Sudoku

503 reviews
Content rating
Everyone
10K+
Downloads
Content rating
Everyone
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About this game

Presented by Cracking The Cryptic, YouTube’s most popular Sudoku channel, comes a new game featuring one of the most popular puzzle types: Thermo Sudoku.

How does Thermo Sudoku work? Well each sudoku grid contains thermometer shapes (often drawn to create themes) and digits on thermometers must increase as one moves further from the bulb end. The interactions between the thermometers leads to new logical ideas and patterns that completely refreshes the standard sudoku solving experience.

As with their other games (‘Classic Sudoku’, ‘Sandwich Sudoku’ and ‘Chess Sudoku’), Simon Anthony and Mark Goodliffe (the hosts of Cracking The Cryptic) have personally crafted the hints for the puzzles. So you know that every puzzle has been play-tested by a human being to ensure that the sudoku is interesting and fun to solve.

In Cracking The Cryptic’s games, players start with zero stars and earn stars by solving puzzles. The more puzzles you solve, the more stars you earn and the more puzzles you get to play. Only the most dedicated (and cleverest) sudoku players will finish all the puzzles. Of course the difficulty is carefully calibrated to ensure lots of puzzles at every level (from easy through to extreme). Anyone familiar with their YouTube channel will know that Simon and Mark take pride in teaching viewers to be better solvers and, in these games, they always craft the puzzles with the mindset of trying to help solvers improve their skills.

Mark and Simon have both represented the UK many times at the World Sudoku Championship and you can find more of their puzzles (and lots of others) on the internet’s biggest sudoku channel Cracking The Cryptic.

Features:
100 beautiful puzzles
Hints crafted by Simon and Mark!
Handcrafted Thermo Sudoku puzzles by YouTube's most popular Sudoku channel!
Updated on
Dec 7, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
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  • No data collected
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Ratings and reviews

471 reviews
Christopher Goetting
July 6, 2021
Alright, I've finished all 80 puzzles currently in the app. #79 was a bit of a disappointment as the solve path felt like repeated bifurcations and backtracks rather than actual deductions (a lot of if RxCy was arbitrarily z, then it wouldn't work a few steps later). That said, #80 more than made up for it, ending on a very high note and the other puzzles were all excellent and interesting as well. Can't wait for more puzzles and now have to decide which other app I want to tackle next!
6 people found this review helpful
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Philip Wels
July 18, 2022
I really enjoyed this app. There were a lot of clever puzzles in this one. My only complaint is the hint systems. The regular hints occasionally are not explained well and flipping back and forth between the regular hints and smart hints means clicking back several times and the button moves each time you click... there must be a better way to do this.
4 people found this review helpful
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Sarah Cartwright
May 22, 2020
Edit: the bug has been fixed already! I have enjoyed the puzzles that I have played so far, this is my first time playing this variant, and it is a nice twist. The auto rotate stays on in the apl, even though it is disabled on my phone. This is unfortunate since I usually play while laying in bed and the view does not line up with my actual orientation. It would be great if this were fixed, or made an option.
15 people found this review helpful
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What’s new

Compatibility updates