Here's a batch of demos, but given the number of multipass entries and secrets accessed before completing the room, I'm not sure how much utility they'll have.
×#1 is the best place to learn a useful skill, and the later entries are generally easier.
#1
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×Try the far left.
#2
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×Not necessarily always as complicated as it seems. Take it a step at a time. Aim for exits, in order,
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×NW, SW, E
#3
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×No, you can't navigate the lower right bomb passage with the bombs still there.
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×There's more than one way to deal with the snake.
#6
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×Follow the instructions you receive at the start of the room.
#7
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×If something seems impossible, it might actually be impossible.
#9
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×There's only so much that can be done on each pass, even if it's not immediately obvious how it's useful. Overall, exits and reentrances go clockwise.
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×1: Use immediately available toys to get past the northern briar.
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×2: Now you can get to the mimic potion early enough to use it to keep the fluff alive. The exit may be more obvious from the level entrance.
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×3: The scroll in the entrance is used on this pass; use one of Shattered Mines' main tricks.
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×4: Now the fluff dies in a less problematic place; go for the southwest, and deal with the mimic last to preserve sanity.
#10
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×Letting the fluff form clouds is fine; just make sure not to destroy fluff when breaking the clouds apart.
#11
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×The main trick is in appropriate placement of the kegs.
#12
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×Sword for the first pass, pickaxe for the second, spear for the third. The scattered islands aren't all decoration. The northeastern monsters are open on the right for a reason.
#13
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×Fill the room as much as possible, and then more. Go up the door passage very slowly, and back and forth.
#14
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×The mimic gets you the keg; the keg and your sword get you the mirror; the mirror gets you the caber; the caber gets you the keg back.
#15
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×The drawn lines are guides for keeping the aumtlich turning instead of moving.
#16
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×Horns are weird. Dropping trapdoors in 1N1W can affect where soldiers enter in the hot tile area. There's rather less control over their entry from the east, but a mirror plus two swords will block entry from the eastern hot tiles on every other turn.
#17
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×The bad news is that I've forgotten how I got past the goblins on the first round. But after that, the brain can be kept stunned relatively easily by pushing it in circles. For the second round, one now has time to go back and get past weapons such as the pickaxe; two kegs and a goblin will help Beethro get the roach out.
#19
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×Try leaving the unsecret way and return, if stuck.
#20
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×Firetraps on and firetraps off are both useful in slowing down briar. The pickaxe can hold a fluff stationary to protect a single tile from briar.
#21
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×Comes with its own hints; use them.
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×Beethros next to each other with their sticks crossed to each other's south is a good start.
#22
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×The scripting keeps the door from opening if certain squares of the chessboard are stepped on.
I didn't have enough time to play every entry as much as it'd deserve, so I didn't vote this time, but it was a fun contest nonetheless.