The Devil's Calculator 4+

A Math Puzzle Game

Cinq-Mars Media

Designed for iPad

    • 5.0 • 67 Ratings
    • Free
    • Offers In-App Purchases



A Math Puzzle game named one of the PAX 10 best indie games of the year! Non-Profit and educational with new levels by famous mathematicians Alex Bellos and James Grime

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.

What’s New

Version 6.0

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

Ratings and Reviews

5.0 out of 5
67 Ratings

67 Ratings

viralstitch ,

Amazing puzzles confusing progress saving

I cannot overstate how much I love the concept and the puzzles.

There’s one concern I have however. 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.

There seems to be no easy way to check the progression and that’s frustrating when it gets reset as well. Thank you for the game.

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.

[zoku] ,

Great game that loses progress

Lost progress again from 38 to 33. iPhone XS Max, iOS 12.4.1.

App Privacy

The developer, Cinq-Mars Media, 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

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