I guess I was too used to using it myself on other mods, I didn't think to include this (and possibly other conventions, as well). It's starting with A=1 and B=2, and I will try to include an indicator for this to the manual ASAP.

Just a question: "(If the character is a letter, simply convert it to its numeric value.)" - are you starting with A = 1 or A = 0? There are some modules that convert differently between A = 1 and A = 0, but they at least mention the basis. In this module, the basis is quite critical, as it'd swap all letter conversions between even and odd depending on it!

@porcu93 Just added it, thanks for pointing it out!

Sooo, where's the manual for the module? It's not in the PDF made by the game.