- Steam Autumn Sale - 29 September 2025
Play the award-winning challengeThe Devil's Calculator!Rather than the typical scenario of solving for x in an algebraic expression, imagine the operators themselves were unknown... In this challenging math game, an evil calculator has its normal arithmetic operators replaced with sadistically obscure functions. Using puzzle logic and a bit of algebra, you must work backwards to interpolate and use these corrupted operators to compute the 'number of the beast', 666, to purge the calculator of its demons and conquer mathematical puzzles.If you love math and logic puzzles, also try our newest number game, Equate 8!See The Devil's Calculator, Equate 8, and more on our Developer page:https://store.steampowered.com/developer/cmm
- Steam Summer Sale - 26 June 2025
The Devil's Calculator provides a sophisticated, challenging indie puzzler for lovers of logic and brain teasers. You don't have to be a math whiz to succeed, but it might turn you into a numberphile after all!Play a demo and then buy at a Summer Sale special price!Also try our newest math puzzle, Equate 8! All proceeds from game sales benefit the mission of Cinq-Mars Media non-profit in developing educational games, which are always provided free to teachers and students.
- Steam Winter Sale - 19 December 2024
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! - 27 November 2024
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 - 27 June 2024
Find a new favorite and save now! The Devil's Calculator Trade Bots Copy Editor Lazy Chess Synonymy
- Steam Spring Sale - 14 March 2024
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 - 21 December 2023
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 - 21 November 2023
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 - 29 June 2023
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! - 19 June 2023
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 ga…
- The Devil's Calculator is 50% off in the Steam Puzzle Fest - 21 April 2023
The Devil's Calculator 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 - 16 March 2023
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!
- Steam Autumn Sale - 22 November 2022
Tired of calculating football team standings? Try a different math challenge! The Devil's Calculator is on sale now!
- Steam Summer Sale - 23 June 2022
The Devil's Calculator, Copy Editor, Lazy Chess, and more are all 30% off during the Steam Summer Sale! https://store.steampowered.com/franchise/cmm
- Logic & Numbers Bundle - 19 November 2021
The Devil's Calculator is featured in the new Logic & Numbers bundle. Get 16 fantastic puzzle games at a significant discount! If you already own The Devil's Calculator, you will get an additional amount off of the price. If you don't own it, consider this amazing bundle! You know you'll want some variety to play when the colder weather keeps you inside! https://store.steampowered.com/bundle/23432/Logic__Numbers__Best_Games/
- 50% off during the Steam Halloween Sale - 28 October 2021
The Devil's Calculator is 50% off for the Steam Halloween Sale! Named a PAX Top 10 Indie Game and a Webby Award Nominee, the Devil's Calculator is an exciting challenge for numberphiles, math novices, and puzzle lovers.
- New Game Mode and UI Improvements! - 2 September 2021
Hi Everyone, This is Chris, the lead developer. I'm so pleased to announce that after a considerable hiatus, we were able to find the time and resources to integrate a few features we've been wanting to add for a long time. One of the biggest points of feedback we received was the somewhat tedious menu system - we made an artistic decision to try and go for an analog / diegetic feel with the menus, and that became frustrating for players, particularly with the DLC content. The first thing we did was create a simple action sheet that can be accessed by holding down "levels" or by hitting "help" and pressing the "7" key, which now has a hamburger icon on it. This menu will provide access to an ordered list of all the DLC levels for easy navigation, as well as.... a new game mode just in time for the school year! I had always wanted to develop an engine that could procedurally generate lev…
- Summer Sale | LIVE Developer Play - 26 June 2021
In celebration of the Steam Summer Sale, we're playing The Devil's Calculator and answering all of your questions live!
- Lazy Chess DLC - 12 March 2021
Well well well, what have we here? 😈 Lazy Chess created a DLC Level for it’s evil older sibling, The Devil’s Calculator 🔥 It’s a wickedly challenging crossover! Use skills you gained in our new game Lazy Chess to noodle out a fiendish mathematical puzzle. Available now, free, in every copy of The Devil’s Calculator, our Webby-Nominated math puzzle game!
- Webby Nominee for Best Puzzle Game - 2 May 2020
Our non-profit is honored to shared that our puzzle math game, The Devil's Calculator, was nominated for a Webby Award for best puzzle game of 2020. The winner is determined by public vote so we need your help! https://vote.webbyawards.com/PublicVoting#/2020/games/general-games/puzzle We're always updating new DLC levels, so follow us on @devilscalc and reach out if you need help coding a level for the community. Hope everyone is staying safe and coping as best they can under the circumstances. Thank you all for your support.
