×Serpents:

A serpent first checks to see if Beethro is directly in front of or behind its head. If he is, the serpent continues moving in that direction. It also has an internal counter; the first five turns it prefers horizontal movement, the next five it prefers vertical, and then this repeats. The serpent picks a square into which it wants to move; if it is thinking horizontally, then it picks which of the two squares horizontally adjacent to its head is closer to Beethro. If it is in the same vertical column as Beethro, it picks which of the two vertical squares adjacent to its head is closer to Beethro. Note that the square it picks may be occupied by a wall or the serpent's own body. If it is thinking vertically, it does the same thing but looks at the vertical squares first, then the horizontal squares. The serpent then tries to move into the square that it has picked. If that square is blocked, the serpent tries to move N, then E, then S, then W. If it can't move into any of those squares, its tail shrinks by one square. Serpents will always try to move unless its head is outside of smelling range when Beethro is invisible, in which case it will only move if a brain is within smelling range of Beethro.

×A nice set of rooms. My favourite was probably the first secret room. The brained room was maybe a little out of place as it requires different knowledge to the unbrained rooms. The room outside the second secret room is an excellent instructional room for snake manipulation.

×I was able to kill the top snake completely while the bottom snake was still out of smelling range. This wasn't much like the solution to Sssslitherin!, but it was the only one I could find...is that the way you're expected to do it?

I can provide a demo if desired.