Today I made this topic to share a small upside-down bullet bill launcher library of mine.
It basically changes nothing besides the sprite of the bullet bill launcher and the fact that it stays in air but it's a pretty convenient way to do it (at least in my eyes).
These files don't use any custom NPC slots, all they do is add an extra-setting to the bullet-bill launchers that makes them upside-down if checked.
A small image showing a pleasant level in which the upside down bullet bill launchers have been used.
NOTE: The download link has a .rar file that contains a npc-21.lua, npc-21.ini and a extra-settings folder. Just put the files in your episode folder and don't interact with stuff in the extra-settings folder, like moving the .json file outside as it won't work.
Download link: Click here