The interface of the game is reminiscent of a scientific calculator and the objective of each level is to calculate the number 666 using all of the up to 3 available symbols that each represents a mystery function. Graphing results and recognizing patterns within these functions allow players to strategize on how they will use these functions together to generate the integer 666, while avoiding buttons that are disallowed for that level. The M1, M2 and M3 keys allow players to save their computations in memory as they tackle the level. (screenshot below)
You are free to submit as many levels as you like.