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95% positive of 92 · Very Positive · Live from Steam
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Free on Steam. The demo has its own app, so its players are counted separately.
The Devil's Calculator is a new, non-profit math game by the creator of Synonymy that proves a sophisticated, challenging and educational indie puzzler for numberphiles and lovers of logic and brain teasers
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What changed on Steam for this game since we started following it: prices and sales, builds, name, release date and review score.
Review score: 95% on 2026-11-01 → 95% today (92 reviews)
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Does not work on Steam Deck. Results from Valve's own testing.
Valve hasn't published test details for this game.
Every build released on Steam for this game since we started tracking it, with the developer's patch notes. Updated within minutes of each new build.
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 op…
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 …
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:
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?
Find a new favorite and save now! The Devil's Calculator Trade Bots Copy Editor Lazy Chess Synonymy
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 …