The Devil's Calculator cover
The Devil's Calculator screenshot
Linux PC Mac Android iOS Steam
Genre: Puzzle, Strategy, Indie

The Devil's Calculator

Steam Winter Sale

During the Steam Winter Sale, try Cinq-Mars Media's games and take advantage of the discounts!

Also check out our newest game, CrossAbout, at 20% off.

The Devil's Calculator as presented at the MoMath conference:

The Devil's Calculator discounted in the Steam Autumn Sale!

You don't have to be a math whiz to enjoy playing our award-winning puzzle game, The Devil's Calculator! The total will always be 666. Can you find the equation?

Steam Summer Sale

Find a new favorite and save now!

  • The Devil's Calculator
  • Trade Bots
  • Copy Editor
  • Lazy Chess
  • Synonymy




Steam Spring Sale

Including The Devil's Calculator, Trade Bots, Copy Editor, Lazy Chess, and Synonymy

Play demos, find your new favorite, and buy it at a low price!

Proceeds benefit the Cinq-Mars Media Nonprofit mission of developing educational games and technology. Our games are always free to students and educators.

Cinq-Mars Media is a 501(c)(3) charitable organization based in Kalamazoo, Michigan.

Steam Winter Sale

The Devil's Calculator and other games from Cinq-Mars Media non-profit are all on sale!

Try a demo and find a new favorite!

https://store.steampowered.com/cmm

The Devil's Calculator and other Cinq-Mars Media games discounted

Get our award-winning math game, The Devil's Calculator, at a special price! You don't have to be a math whiz to love this puzzle game!

Cinq-Mars Media games are always free to educators and students who contact us.

Steam Summer Sale

All Cinq-Mars Media games are 20-40% off during the Steam summer event!

Try a demo and find a new favorite!

Seamless Discord and Wolfram Integration, UI + Speed Improvements and Podcasts!

Our team has made a long overdue update to the game in celebration of our non-profit's latest release, Trade Bots!

Along with several bug fixes, performance improvements and upgrades to modern frameworks, we've added several new features, all in widescreen mode. (by default, the game opens in a vertical window, but you can full screen the game by hitting the expand button on all three platforms).


  • Wolfram links no longer open externally, instead they open directly within the calculator viewport and can be controlled within the game.
  • Discord has been integrated natively (using the above method). We had honestly not been that familiar or comfortable with discord, but have come to find it's a wonderful way to engage directly with the community. We're closely monitoring the server and hope it continues to thrive.
  • Embeds of some of our favorite podcasts are now integrated directly into the game for you to listen to while playing or making your own levels.
  • The UI in wide mode has changed to include six buttons instead of four.
  • New keybindings to make the game even more friendly on desktop.


Thank you so much for playing and for your continued support of educational gaming. Please consider trying the free demo of our latest game, Trade Bots and reading about its development here.

The Devil's Calculator is 50% off in the Steam Puzzle Fest

The Devil's CalculatorĀ is a captivating math puzzle game based on a narrative in which an evil calculator has had its normal arithmetic operators replaced with sadistically obscure functions. Using logic and a bit of algebra, you must work backwards to find the equation for the "number of the beast," 666, at each level. Innovative and addicting, this game will appeal to numberphiles and math novices alike.

The award-winning Devil's Calculator was chosen as a PAX Top 10 Indie Game in 2019.



Steam Spring Sale

Cinq-Mars Media games discounted
33-75% in the Steam Spring Sale!




  • Copy Editor
  • The Devil's Calculator
  • Lazy Chess
  • Synonymy


While you're browsing, you can also download
our new demo, Trade Bots!