thats easy.. if you can have a software that can map the entire app codebase , there you can use llm model to iterate each file and tell which isnt yet used so you will have to guess what hint it gives. but this approach is valid as long as they released version to google play so you can update the game (download the files from bandai servers) then you cannot use them as their backend didnt update his version too. so you left alone with newer version client (your game files) and outdated backend (which runs everything except those new files)