×Entrance: Nice basic brain puzzle.
1E: Same.
2E: What mxvladi said. Neat small manipulation puzzle once fixed, though.
1S: Same idea as 1E, obviously. Main puzzle seems to be determining the correct entrance square.
2S: I kill one goblin immediately and use the tunnel to dodge the other. Simple and easy.
2S1W: Quick snake manipulation. Of course, one can kill the snake just by standing still if one is willing to wait for a while.
2W1E: Trickier. Probably not an outlier given the overall simplicity of the room, but certainly the hardest so far.
1W: Very easy.
2W: Someone's probably going to beat this without bringing the goblins over two at a time, but it's not going to be me.
1N: Also very easy.
2N: I assume this is designed to lure out and trap the lower goblins one at a time and then invade the upper area and easily kill those four. As with 2W, I'm guessing it can probably be done other ways by someone good with goblins.
2N1W: Got tired of trying to send the snake all the way to the end, so I activated both eyes and held one south of the rocks. I don't think this is what you want.
2N1E: Meh.

×My holds: Beethro's Brain, Entropy, Further Up and Further In, Washed Ashore, Hinterlands, Hypercube, jfflpnk, Lavender Levels.
Collaborations: Way Forward, Advanced Concepts 2

×Kill the brain last. Brained roaches prefer to move orthogonally, rather than diagonally. This orthogonal movement allows you to "dance" around brained roaches.