The Devil's Calculator6.0 - App Store

An evil calculator has its normal arithmetic operators replaced with sadistically obscure functions. Using logic and algebraic puzzle solving, 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 along with several DLC levels, authored by famous mathematicians like Alex Bellos, Grant Sanderson, James Grime, Tony Padilla and James Tanton! The game was named a fan favorite of GDWC, and one of the top 10 indie games of 2019 by PAX.

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. The game was celebrated at the MOVES conference by the National Museum of Mathematics in New York City.

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.

Version History Bug fixes and performance improvements, along with a contextual menu and a procedural engine for building theoretically limitless challenges! 6.0 08/25/2021 - New DLC by famous mathematician and Guardian Puzzle Contributor Alex Bellos and 3Blue1Brown's Grant Sanderson
- New level enhancements to celebrate the game's featuring at PAX 10 and at the National Museum of Mathematics
- Deeper integration in official collaboration with Wolfram Alpha on many different types of integrations including improved Wolfram Cloud support and MathWorld references
- Performance enhancements along with a wide range of major bug fixes, UI optimizations and level design improvements
- Fully offline calculator and guide streamlined and integrated within the app 5.5 10/03/2019 - New DLC by famous mathematician and Guardian Puzzle Contributor Alex Bellos and 3Blue1Brown's Grant Sanderson
- New level enhancements to celebrate the game's featuring at PAX 10 and at the National Museum of Mathematics
- Deeper integration in official collaboration with Wolfram Alpha on many different types of integrations including improved Wolfram Cloud support and MathWorld references
- Performance enhancements along with a wide range of major bug fixes, UI optimizations and level design improvements
- Fully offline calculator and guide streamlined and integrated within the app 5.4 09/21/2019 - New DLC by famous mathematician and Guardian Puzzle Contributor Alex Bellos and 3Blue1Brown's Grant Sanderson
- New level enhancements to celebrate the game's featuring at PAX 10 and at the National Museum of Mathematics
- Deeper integration in official collaboration with Wolfram Alpha on many different types of integrations including improved Wolfram Cloud support and MathWorld references
- Performance enhancements along with a wide range of major bug fixes, UI optimizations and 5.0 09/18/2019 - New DLC by Tony Padilla and other mathematicians
- Deeper integration with Wolfram Alpha including custom hints, notebooks and scatterplots
- Wolfram MathWorld resources for all puzzles
- Interactive Tutorial added for first level
- Improved BigInt performance across the game
- Bug Fixes including issues with data persistence for DLC and community levels
- Wolfram Cloud API integration for advanced functionality 4.0 04/20/2019 Miscellaneous bug fixes and stability improvements for DLC 3.7 03/29/2019 - Improvements to menu intuitiveness
- Bug fixes, including one that made it difficult to replay from certain levels
- subtle performance enhancements 3.5 03/28/2019 - Lots of bug fixes along with stability improvements
- total refactoring of the calculator logic for vastly improved performance, particularly on older devices
- Faster startup time
- increased responsiveness using the interface
- DLC enhancements and new Online Community Level features
- Improved level creation tools
- New DLC levels from mathematicians including James Tanton and James Grime! 3.1 03/20/2019 Deeper, more fluid Wolfram alpha integration along with minor bug fixes and asset compression that results in up to a 15% speed boost on some devices. 2.5 03/07/2019 Lots of improvements, including an overhauled creation system now based on math.js that supports complex numbers and advanced functionality. Fixed several miscellaneous bugs including one that effected negation in some contexts, and integrated a more robust debugging system overall. User Challenges much more stable. Some subtle performance enhancements. 2.2 03/06/2019 We've been working tirelessly and making lots of improvements based on feedback:
- graphing now allows for zooming, panning and scanning
- menu navigation now much more intuitive
- DLC menu to access new, featured content added regularly
- Ability for post game levels to feature any integer as a win condition, instead of just 666
- streamlined method for teachers and students to gain access to the full game's features
- creation tools (and newly added DLC) available from outset of game
- Added resources for level assistance including better custom tooltips
- Easier and simpler level skipping
- muted reminders

We also crushed some bugs and made major performance enhancements:
- idle performance up to 18% faster on some devices
- cheating exploit patched
- fixed edge case errors for some levels
- completely reconceived level 64
- fixed server issue where multiple post calls would be needlessly made. 2.0 02/25/2019 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. 1.2 01/25/2019 Minor bug fixes and performance enhancements, addition of a scoring metric, more tutorials and better stability within the postgame. 1.1 01/21/2019 1.0 01/11/2019