A modding update has been released.
This is only 16a because I’d like to do more work with it. It is fairly unoptimized for now, but I have an idea to fix that.
AN UPDATE TO THE MARIO MODSET HAS ALSO BEEN RELEASED! The only set is now obsolete. From now on, there probably isn't going to be any large syntax changes, I will be adding more options for rooms and stuff, but besides that, there won’t be too much. Check the downloads tab for more.
AN UPDATE TO THE MODDING SYNTAX PAGE HAS ALSO BEEN RELEASED. Docs.google.com