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About the application:

An evil calculator has its normal arithmetic operators replaced with sadistically obscure functions. Using logic and a bit of algebra, you must work backwards to interpolate them and purge the calculator of its demons. This fresh, non-profit calculator mini game by the creator of Synonymy is sophisticated, and challenging. Non-profit and open-source, The Devil's Calculator is a highly original indie mini game that's as addicting as it is educational. Available to numberphiles and math novices alike, the first 20+ levels are 100% gratis to play and have fun. 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 easy, yet innovative level design provide considerable depth to the video test. Users unblock the ability to make their own levels and play challenges others have made - including gratis 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. Cinq-Mars Media is a 501(c)(3) non-profit organization developing technology to help scientific research similar to human security and education, and to create such technology and research accessible on a charitable basis.