That's what I did, now I can't get rid of the rocks
If you now have this:
| Medusa | V-Splitter | H-splitter | Rock |
| Medusa | V-Splitter | Rock | |
| Wall | Flag | Cat |
Then up followed by left will clear the first rock and give you a fresh cat. After that you can use the H-Splitter->V-Splitter to duplicate the cat.
I misremembered though - you only need one extra cat. I thought I had to replace the destroyed rock, but I didn't have to.
You do!?? Congrats. I'm still missing two cryptids. I just went back over (I think) every room last night (although I didn't check them off on a grid or anything as I went, I probably should have), and I don't see *any* room that has a wormhole I haven't activated or where I can "break" an exit that I haven't already.
Lol yeah, I realized that after my first ill-conceived walkthrough of the entire map almost became a second one trying to find my last missing portal shortly after posting that comment.
Apparently I'm clever enough to figure out how to maneuver multiple cats through all sort of mazes... but not clever enough to use a viewfinder 🤣