×
1E: as soon as I entered I thought, where is the pressure plate? KDD level 11 flashback hit me hard, as I don't use tar vision (maybe it's just me, but a vision token could be useful, since you use in 5E as well).
The room is nice, I initially tried a strategy which did not work, so I decided to clear all of the south chamber first, and then run to the north. However, I realized only at the end that I didn't need to clear all the tarstuff (dumb me).

2E: definitely easier than 1E, the problem here was NOT efficiency, but finding a good gel shape.

3E: I liked this a lot but maybe I broke it? I used either 1 or 2 stuns per cycle (depending on how you consider a stun happened at the spawn turn) but I did not use efficiency at all. I just went back and forth to prevent bad mud shapes in the northern alcoves.

4E: also liked this a lot, good efficiency is needed to both maneuver the decoys and cut the mud. I probably overcomplicated it, but it's fine I think.

5E: urgh, I stopped here since I find it a bit boring and cannot seem to make progress so far. Am I missing some strategy?

×
The early bits are definitely easier, but it's a gentle difficulty curve.

Vision tokens added in 1E.

3E isn't hard - but the challenge is somewhat tricky. I set it to one stun maximum, but forgot to update the scroll. I am thinking that maybe I should move the scroll so as to not give the room away, but... it's not like that should stymie people much.

4E can be done much faster, but maybe not easier. Hard to say.

5E: This is one of the trickier rooms (and one of the longer ones). The goal here is to use the walls to slow tar growth (obviously). One trick I like is that you can also use babies to stop growth in an area - if you get babies in the NE corner, you can block 6 tiles of tar.

It's possible from a number of angles, but using babies to block tar is a key to making it easier. It might be required when trying to clear from the West side of the room, but you don't have to if you cut through and clear from the East side of the tar.

×
4E - I had a lot of trouble with this: there are many failure states that became apparent too late, after killing the second mud mother, with decoys being buried in mud or having no accessible edge, and it takes a lot of undos to fix the mistake.
5E - conversely, I found this rather straightforward.
7E - I don't understand this room.
8E, 9E - I can't get any headway, the things the rooms seemingly want me to do appear to be hopeless. There is definitely an element of boringness and repetition here: having to ferry the mirrors/kegs one after the other, while fighting the babies does feel like and endless slog (unless there is a trick to these rooms that I've missed).

I haven't tried the rest.

×You need tar in the northern alcoves and mud in the southern ones (that's why there's blue/red relay stations in the walls). The main trick of the room is figuring out how to get them to cross.

×You need the rock piles, obviously.