Free Steam Key for Students & TeachersOur 501(c)(3) non-profit is committed to making our games freely accessible for educational purposes. If you are a current student or educator with a .edu or .ac.uk email address, get your free steam key by emailing us or following the instructions on our website!关于游戏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 and use these corrupted operators to compute the 'number of the beast', 666, in order to purge the calculator of its demons and continue on. 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 in the game's