I technically could have only 1 bmp map for decoration and collision since 3 values per pixel from the RGB would be enough. However, I wanted both the bmps to somewhat resemble the level so it can be more easily edited. So if I use only 1 bmp, I feel like that won't be the case anymore. But that may be changed in the future, so I will keep this in mind. Thank you! As for the UI/AI for NPCs, that is the next thing I wanted to work on.