An evil calculator has its normal arithmetic operators replaced with sadistically obscure functions. Using logic and a bit of algebra, 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 James Grime and James Tanton!

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.

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.

What’s New

Version 4.0

- 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

Ratings and Reviews

4.9 out of 5
27 Ratings

27 Ratings

I paid for a season pass ,

Weirdly addictive

I hate math, so I was initially intimidated by the description, but don’t worry - it’s much more of a puzzle game. Super intuitive, challenging enough that you feel smart but not so hard that it’s not fun. I can’t stop playing, I love it.

Buster2004 ,

Devils Calculator Diabolical!

If you like math and puzzles this is for you. Definitely strains your brain and yet I am willing to keep trying.

Josh (TxTech) ,

Awesome Game

The recent update fixed it for me. Game rules, as expected.

Developer Response ,

Hey Josh, are you still experiencing this issue with the latest version? We're so sorry, pulling our hair out trying to replicate this. What'd device and OS? Contact us at and we'll do everything we can to make it up to you.


Cinq-Mars Media
65.4 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© Cinq-Mars Media
In-App Purchases
  1. Full Version of Game $2.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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