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.

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 1.2

Fixed a bevy of errors including one that made level 34 impossible to beat (thank you for your feedback!). Some minor performance enhancements and subtle UI clarity fixes.

Ratings and Reviews

5.0 out of 5
6 Ratings
6 Ratings
J0ciebaby527 ,

So much fun. Really.

Who thought a math game could be such fun!? I teach math at the 7th grade level and I’ve been sharing this game with my students. While most don’t comprehend the algebra needed to solve the levels “traditionally”, watching them figure it out using other logical methods is extremely rewarding, and anything that gets people excited for math earns an A in my book. Haven’t finished the game yet or gotten to the part where I can make and share levels, will update my review when I do.

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.


Cinq-Mars Media
52.4 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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