I think I've worked out how to do that, except I don't seem to be able to get started on it soon enough.
Click here to view the secret text
×Plan: Destroy one blob immediately. Get into a pressure plate passage, split the mud in that passage into two blobs, let it grow in both directions.
Problem: I haven't been able to do this before the third cycle while still keeping the other two blobs manageable. But if I start the process on the third cycle, the blob is one cycle short of hitting the further pressure plate before time is up.
So how do I pull this off?