# The Devil's Calculator — A Math Puzzle Game

> Logic puzzle game where players decipher obscure arithmetic operators. (iPhone/iPad app by Cinq-Mars Media.)

- Source: https://appshunter.io/ios/app/the-devils-calculator/id1447599858 (this page in markdown: same URL + `.md`)
- Developer: [Cinq-Mars Media](https://appshunter.io/developer/924648806)
- Category: Games, Education, Puzzle, Strategy
- Price: Free with in-app purchases
- Rating: 4.80/5 from 228 App Store ratings · 39 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 77 MB
- Languages: American English
- Released: 2019-01-11
- Data updated: 2026-09-07
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/the-devils-calculator/id1447599858/reviews.md

## What is The Devil's Calculator?

An evil calculator has its normal arithmetic operators replaced with sadistically obscure functions. Using logic and algebraic puzzle solving, you must work backwards to interpolate them and purge the calculator of its demons. 

Non-profit and open-source, The Devil's Calculator is a highly original indie game that's as addicting as it is educational. Accessible to numberphiles and math novices alike, the first 20+ levels are 100% free to play and enjoy along with several DLC levels, authored by famous mathematicians like Alex Bellos, Grant Sanderson, James Grime, Tony Padilla and James Tanton! The game was named a fan favorite of GDWC, and one of the top 10 indie games of 2019 by PAX.

Each level has you decipher the function of a mysterious operator and use it to calculate the number of the beast to progress. Advanced graphing mechanics, countless features and simple, yet innovative level design provide considerable depth to the gameplay. Players unlock the ability to create their own levels and play challenges others have created - including free DLC levels crafted by the game's creators, educators and mathematicians. With hand drawn artwork and a charming story, the Devil's Calculator is a genuinely fun and gratifying puzzle experience. The game was celebrated at the MOVES conference by the National Museum of Mathematics in New York City.

Cinq-Mars Media is a 501(c)(3) non-profit organization developing technology to support scientific research related to human safety and education, and to make such technology and research available on a charitable basis.

## Key features

- Obscure operator deciphering
- Algebraic puzzle solving
- User-created levels
- DLC levels by mathematicians
- Graphing mechanics
- Hand-drawn artwork

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full Version of Game | $2.99 | one-time |


## What do users think of The Devil's Calculator?

Overall sentiment: positive

**Pros**

- 💡 Most creative idea ever
- 🧠 Genius puzzle design
- 👍 Fun and educational
- 🚀 Brilliant game concept
- 🤓 Great for math lovers
- ✨ Unorthodox math thinking
- 💯 Infinitely clever
- ✅ No ads (mostly)
- 🎮 Great for passing time
- 💡 Replaces school math
- 🧠 Brain busting challenges
- 💯 Very clever and fun
- 🏆 Top puzzle game
- 🤩 Awesome game
- 📚 Compels learning new concepts
- 🌟 Well-designed puzzles
- 💡 Innovative math puzzles
- 👍 Great for logic games
- 🎮 Highly addictive
- 💯 Groundbreaking for users
- ✅ Affordable app
- ✨ Creative and intelligent
- 👍 Good for no wifi
- 💯 Best game for math
- 🤩 Absolutely fun
- 💡 Unique puzzle mechanics
- 🧠 Strains the brain
- 💯 Great concept
- 👍 Enjoyable puzzles
- ✅ Good for mental exercise
- 🎮 Highly recommended
- ✨ Fun and challenging
- 👍 Good for problem solving
- 💯 Well made
- 💡 Brilliant mix of code-breaking and math
- ✅ Good DLC content
- 👍 Fun with family
- 💯 Very good game

**Cons**

- 😠 Tedious late puzzles
- 🐛 Calculator responsiveness issues
- 🐛 Wolfram graphing feature doesn't work
- 🐛 Progress saving issues
- 🐛 Calculator malfunction
- 🐛 Exploit allows bypassing levels
- 🐛 Graph to Wolfram Alpha function doesn't work
- 🐛 DLC Level 6 problem
- 🐛 Lost progress
- 🐛 Confusing progress saving
- 🐛 Very dull and tiresome
- 🐛 Arbitrary and unsatisfying puzzles
- 🐛 Trial and error heavy
- 🐛 Basic and bland calculator interface
- 🐛 Loading screen issue
- 🐛 Third operator puzzles tedious

**Commonly reported bugs**

- Some late puzzles with the third operator get too tedious with too much trial and error
- The built-in calculator needs some work and button responsiveness isn’t always the best.
- The graph to wolfram alpha function doesn’t seem to work.
- There’s unfortunately an exploit I accidentally discovered that allows you to bypass any level.
- The “real” calculator malfunctions when you want to use the answer you got previously, like if I input “330 * 2”, getting 660, then pressed “+6” on the next row, instead of showing 660 + 6 = 666, it’d show 2+6 = 8
- Lost progress again from 38 to 33. iPhone XS Max, iOS 12.4.1.
- My progress seems to be undone somewhat arbitrarily. I was working through the 50s, and when I booted up the game today, my progress had reset to level 35.
- The wolfram graphing feature doesn’t work.
- There’s a problem with DLC LEVEL 6 however.

**Most requested features**

- Update the app
- Fix DLC Level 6
- More levels

## Recent user reviews (10 of 39)

All indexed reviews: https://appshunter.io/ios/app/the-devils-calculator/id1447599858/reviews.md

### 2/5 — Problems

*2026-03-27, version 6.0*

Ads

Completely frustrating operations

Me having to skip levels

### 4/5 — Truly an educational game

*2026-01-28, version 6.0*

Unlike most attempts, which can more accurately be described as “educational” game or educational “game”. I’m genuinely having fun while also brushing up on my math and logic. Who knew the number 666 could provide such a wide variety of puzzles.

Update: knocking off a star because some of the late puzzles with the third operator get too tedious with too much trial and error

### 5/5 — Insane

*2025-12-31, version 6.0*

Most creative idea ever
No ads(besides ones that you can close immediately and self promote their other games)
Fun
Best game for no wifi(however if you don’t have wolfram downloaded you can’t use it)

### 5/5 — Truly an educational game

*2025-12-15, version 6.0*

Unlike most attempts, which can more accurately be described as “educational” game or educational “game”. I’m genuinely having fun while also brushing up on my math and logic. Who knew the number 666 could provide such a wide variety of puzzles.

### 2/5 — Why?

*2025-09-07, version 6.0*

Cant use devils calculator as a calculator instead you have a second basic and bland calculator. interesting concept, actual calculation interface ruins the immersion.

### 5/5 — It’s bad just a loading screen σ_σ

*2025-07-25, version 6.0*

UPDATE NOWWWWWWWW

### 5/5 — Genius

*2025-05-19, version 6.0*

If you love puzzles & logic games, and are okay with basic maths, this game really is brilliant. You can use the calculator as much as you want in terms of guesses, and explore your possibilities. Algebra meets functions & you can skip a level you can't figure out. Some of them I still haven't solved, but that's probably the fun of it! Thank you for making such a creative intelligent and affordable app!

### 5/5 — Amazing

*2025-02-13, version 6.0*

This game is exactly how my brain works out formulas in math. Ive never been amazing at math but I’ve always tried to explain to people that my brain thinks math in an unorthodox way. The Devils calculator is how my brain works out math in a nutshell. This is groundbreaking for me.

### 5/5 — Great puzzle game

*2024-11-17, version 6.0*

I love this game I think I’m a little too addicted to this but amazing game

### 5/5 — Get this game right now

*2024-11-12, version 6.0*

very fun, had a blast playing

## Frequently asked questions about The Devil's Calculator

### What is The Devil's Calculator?

The Devil's Calculator is a non-profit, open-source math puzzle game. It challenges players to decipher obscure arithmetic operators by using logic and algebraic puzzle-solving techniques to work backward and understand their functions.

### What are the key features of this game?

Key features include deciphering mysterious operators, solving algebraic puzzles, advanced graphing mechanics, the ability to create and play user-generated levels, and free DLC levels authored by mathematicians. The game also boasts hand-drawn artwork and a charming story.

### Is The Devil's Calculator free to play?

Yes, the first 20+ levels are 100% free to play. The app also offers additional DLC levels, some of which are free, and allows for in-app purchases for further content or features.

### What kind of math is involved in this game?

The game primarily involves logic and algebraic puzzle solving. Players need to decipher the functions of obscure operators, which requires understanding how they manipulate numbers, similar to solving equations or interpolating unknown functions.

### Who is this game designed for?

This game is designed for a wide audience, including numberphiles and math novices. Anyone who enjoys logic puzzles, algebraic challenges, and educational games will find this app engaging and gratifying.

## Version history (last 5 releases)

### 6.0 — 2021-08-25

Bug fixes and performance improvements, along with a contextual menu and a procedural engine for building theoretically limitless challenges!

### 5.5 — 2019-10-03

- New DLC by famous mathematician and Guardian Puzzle Contributor Alex Bellos and 3Blue1Brown's Grant Sanderson
- New level enhancements to celebrate the game's featuring at PAX 10 and at the National Museum of Mathematics
- Deeper integration in official collaboration with Wolfram Alpha on many different types of integrations including improved Wolfram Cloud support and MathWorld references
- Performance enhancements along with a wide range of major bug fixes, UI optimizations and level design improvements
- Fully offline calculator and guide streamlined and integrated within the app

### 5.4 — 2019-09-21

- New DLC by famous mathematician and Guardian Puzzle Contributor Alex Bellos and 3Blue1Brown's Grant Sanderson
- New level enhancements to celebrate the game's featuring at PAX 10 and at the National Museum of Mathematics
- Deeper integration in official collaboration with Wolfram Alpha on many different types of integrations including improved Wolfram Cloud support and MathWorld references
- Performance enhancements along with a wide range of major bug fixes, UI optimizations and level design improvements
- Fully offline calculator and guide streamlined and integrated within the app

### 5.0 — 2019-09-18

- New DLC by famous mathematician and Guardian Puzzle Contributor Alex Bellos and 3Blue1Brown's Grant Sanderson
- New level enhancements to celebrate the game's featuring at PAX 10 and at the National Museum of Mathematics
- Deeper integration in official collaboration with Wolfram Alpha on many different types of integrations including improved Wolfram Cloud support and MathWorld references
- Performance enhancements along with a wide range of major bug fixes, UI optimizations and

### 4.0 — 2019-04-20

- New DLC by Tony Padilla and other mathematicians
- Deeper integration with Wolfram Alpha including custom hints, notebooks and scatterplots
- Wolfram MathWorld resources for all puzzles
- Interactive Tutorial added for first level
- Improved BigInt performance across the game
- Bug Fixes including issues with data persistence for DLC and community levels
- Wolfram Cloud API integration for advanced functionality

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All apps by Cinq-Mars Media: https://appshunter.io/developer/924648806

## Related topics

[cinq-mars media](https://appshunter.io/ios/topics/cinq-mars-media)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-07.*