Ghostbusters

Credit goes to Brian from PS4 trophies

Most of the collectibles are rather straightforward if you meticulously go through the levels or follow the video guide in the other solution. Look for the purple arrows on the floor. That's where they usually are.

Except one. The last one. This took me six tries through the last level (Queen of the Darned) before I found it, and that was with the video.

There's a long up-corridor near the end of the level. You have to go all the way down, and then all the way back up to progress. Once you do that, you'll see that the door at the top left opens. Go in there, and a purple spot will be in the top left of the room. Clear that out, and a door will open at the bottom of the room.

This door isn't very obvious. You need to go to the bottom of the room to see it.

Keep cleaning through those rooms, and eventually you'll be back at the main hall. Now go to the right side of the hall and clean out every room there. The final hubcap is in the top right room, but you have to clear everything before that room opens.

I hope that helps everyone who might have gotten frustrated by this last hubcap.