First you want to gather 120 slimes in your vac, preferably of as few types as possible but since vac storage can only go up to 100 I'd personally just recommend a bunch of pink slimes and a bunch of cotton slimes. You don't want largos or tarrs consuming your shot ammo though this bug makes slimeball so free that it shouldn't matter.

When I did the "bug" that I found I got a time of around 30 seconds, so there is some room to vac up more slimes since the cave you'll be doing this in keeps the slimes very close to you, but I still would recommend getting as many slimes as you can.

Next you have to assemble the slimeball goal in a way that wedges it between enough walls that the game gets confused. I honestly don't know why the game allows you to place a slimeball goal with next to no room, but well. Yeah.

I got this to work in the phosphor gordo cave right outside of the conservatory.









I set my goal up right past the tabby plort door, see images for exact placement.


TIP: The slimeball goal can move JUST back and forth as well as JUST left and right so you want to place it at a slight angle to avoid this. Something should obstruct its immediate forwards, backwards, left and right even if said something is a really small part of the wall. My point is the goal can't combine going backwards/forwards with going left/right to go diagonal since it's just too afraid of hitting the wall and clipping (or at least from my limited testing, it's probably more complicated than that but getting it to freeze isn't terribly hard).

As soon as you have the slimes and the goal set up correctly (and have tested that you set it up correctly... if it moves you placed it wrong), just start shooting. This method is so fast that even if something goes wrong but the goal is still not moving, you'll probably be fine.


Here's a video of me getting this to work: