***** MARCH UPDATE *****
20 new puzzles, 80 puzzles total!


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.

40 beautiful puzzles on launch
100 puzzles in all with regular updates to reach this total in the first year post launch.
Hints crafted by Simon and Mark!

What’s New

Version 1.3

20 new puzzles
Smart hints (beta), computer generated hints that will help you enter in the next number
Note: smart hints are not fully supported on all puzzles

Ratings and Reviews

5.0 out of 5
20 Ratings

20 Ratings

thechase651 ,

Amazing puzzles

These puzzles are an amazing variation to sudoku! The rule is so simple, yet it adds so much fun complexity to the game. The user interface is pretty good now that I’m getting the hang of it, but I would give this 5 stars based on the puzzles alone. It’s nice to feel excited about solving sudoku again.

Turiyag ,

Best UX

The UX for this app is just amazing. I'm not sure that there is a better implementation of a sudoku board in any app of website. It's so intuitive and great. The devs should put the same functionality into the Website!

Calenchamien ,

Extremely intuitive to use; really professional appearance

I’m really impressed by this app. More difficult puzzles are unlocked by beating easier ones (which I guess could be frustrating if you’re really good, but I’m not! So it’s fine).
The app will alert you of illegal placements, so you don’t waste too much time, and you have real variety in how you can mark each square - not only with pencil marks of possible numbers, but with a different style pencil mark for set pairs and triplets but also with x’s for focusing on single digits (and where they can’t be placed) and highlighter colors to identify key squares. Really nice!

App Privacy

The developer, Nick Carney, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer's privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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