This is essentially a collection of miscellaneous rooms, each of which stands on their own. As such, the difficulty is highly variable - there's a mix of relatively easy rooms, pretty hard rooms, and one room in particular that seems to take after
Lone Soldier as far as being a difficult horde room.
So, there's a lot of different concepts to look at - for instance, Once North Once East showcases a neat "
room flow control"
mechanism, in addition to being a tough puzzle in its own right.
Give it a try - all rooms are instantly accessible from the start, so you're bound to find one room you like.
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Quick links to my stuff (in case you forgot where it was):
Click here to view the secret text