You can create variables with the let keyword: let a_variable = 12 You can assign them with = and use their values: a_variable = another_variable You can do math with order of operations: 3 * 2 + (my_var - 3) * 5 You can also use: // - divide and round down ** - exponent % - modulo (remainder) You can do multiple things on one line with ; : let a = 1; let b = 2 press D for debug info including all variable key value pairs and lists of all operators along with their priorities, intermediate code representation, etc... press C to return to the console.