Get a see-through tar mod if you haven't already - this room was made before the token unfortunately. And it's frustrating enough on its own.
×Your basic plan should be to first get the trapdoors around the outside - that will give you enough corners to get the remaining trapdoors.
Click here to view the secret text
×When you enter the room, run to the bottom blob and then strafe around anticlockwise cutting the outer blobs. You should be able to get to the upper corner before the first expansion. Clean up the babies and get half of the top line of trapdoors if you can - then rush back around the way you came forming a wall with the trapdoors. From there it's a matter of slowly carving your way through the mud.
It shouldn't matter too much if the mud does escape to the outside - it just makes it cleaning the middle much longer and messier. (just make sure you can escape to the outside again!)