Play the award-winning challenge
The 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:
More from The Devil's Calculator
Other announcements
Steam Summer SaleThe 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 deve…Steam Winter SaleDuring 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?