Making entities (such as NPC-420 Fuzzy and NPC-655 Twister) collide with projectiles

[mutantSackboy4]

Hi,
I'm trying to customize Fuzzies and Twisters like I already have several other ghost enemies for a level I'm making. The difference between these is, however, that they have no collision with any NPCs. I've already set the .txt files' noiceball to 0, and have tinkered with other values as listed on this documentation page, to no avail.

Currently running SMBX2b5r3, if that matters.