Ok! Small progress update: the sample button now spawns a list of the variables it found, where you can enter the value for that variable. And, yes, you’re seeing it correctly.. You can enter variables in variables! When you press the Calculate button, it runs a replace algorithm a set amount of times to make sure that every variable is resolved. However, as you can see, there is a limit! I don’t wanna have this app crash because I accidentally type in an infinitely recursing formula lol. And, yes, I know the keen of you see the code snippet in the second screenshot and are probably furious that I don’t have any code to exit the for loops quicker to save on performance.. I will be looking into that, I promise! For now though, it’s 11PM and I’d quite like to brush my teeth and go to bed. Have a good night and happy coding!