This room is a real gem. All four corners are done differently. Obviously Beethro can't hold down any of the plates, and nothing other than Beethro can cross the tunnels. So you'll have to think about what things can actually cross over orthosquares diagonally:
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×briar growth (seems you already figured that one) explosions, roach queen spawns, and skipper spawns.
Most of the corners aren't TOO hard to figure out. The SE one is probably the trickiest, but it's really neat so I'd encourage you to try to figure it out on your own first.
What to use on which corner (try to figure this out on your own first!)
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×NW
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×place a skipper nest in the corner and let it spawn a skipper in the water. You can then push the skipper to the plate
NE
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×Explode the powder keg to light the fuse.
SW
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×This is the only one that uses the briar. You'll need the guard's help to release the briar since the keg is used elsewhere.
SE
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×Use the queen to spawn a roach egg across the orthosquare. But how to get it down to the arrows? You can only push it horizontally right?
and don't
seem to have enough time to lure it down vertically...
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×unless you push it while it's an egg.
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Links to neat forum tools that I always have trouble finding:
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[Last edited by Insoluble at 04-28-2017 04:30 PM]