Thermo Sudoku in IOS

by Cracking the Cryptic

Walkthrough, Guilds, Tips on this special game

Our Expert Score

87/100

Thermo Sudoku is a brilliant evolution of the classic Sudoku format. For those who find standard Sudoku a bit repetitive, the 'Thermometer' constraint adds a visual, logical layer that completely changes how you view the grid. Numbers must increase as they move away from the bulb of the thermometer, which immediately narrows down possibilities in a very satisfying way.

This app is part of the 'Cracking the Cryptic' collection, meaning the puzzles are hand-crafted by master setters rather than being generated by a computer. This results in a 'logical flow' where you feel like you're following a breadcrumb trail left by the creator. The UI is clean, professional, and includes the essential 'note-taking' tools that serious solvers need. It’s an intellectual treat.

Dinsun reviewed on: Thu Feb 26 2026

The Game

Available on: iPhone, iPad, iPod

Version 1.4Fri Apr 01 2022

20 new puzzles, 100 puzzles total!


***** MARCH UPDATE *****

20 new puzzles, 100 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.

Features:

100 beautiful puzzles

Hints crafted by Simon and Mark!


Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.

***** MARCH UPDATE *****

20 new puzzles, 100 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.

Features:

100 beautiful puzzles

Hints crafted by Simon and Mark!


Ratings & Reviews

4.8 out of 5 with 145 Counts
Age Rating 4+

Screenshots

Thermo Sudoku introduces a unique twist to the classic puzzle. Each grid contains thermometer shapes; digits placed on a thermometer must increase in value starting from the bulb end. This simple rule creates deep logical deductions. Developed by the experts at Cracking the Cryptic, this app features puzzles that have been featured on their popular YouTube channel, ensuring a premium, hand-crafted experience for every solver.

Features

1

100+ Hand-Crafted Puzzles

2

Hint System by Logic Experts

3

Smooth, Modern Interface

4

Undo/Redo and Note Tracking

Tips

Promotion Videos

All the Fun of Thermo Sudoku - YouTube

Related Videos

Gameplays

Q&A

The app starts with an interactive tutorial and easier levels, making it accessible to anyone who knows basic Sudoku rules.

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