Confirmed that
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×blowing the mimic up by having it step on the plate on the same turn as exploding the powder keg, thus letting out the western tarbaby and letting the eastern baby move only one square and get stuck on its door
works, with Beethro nowhere nearby.
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×I pushed the powder keg to the square directly east of the pressure plate and had the mimic step southwards facing east.
After that, all that was needed was to
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×make sure to lure the central tarbaby around the corner and back to the west past the force arrow, through the first open yellow door and get it stuck behind the closed one, before heading eastwards and luring the eastern tarbaby onto the the pressure plate which opens the yellow door to the secret passage, behind the green door
, and then
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× let the eastern tarbaby out, over the pressure plate which closes the door in what used to be the central tarbaby's tunnel, but that doesn't matter any more because you've already let the baby pass that door
, and finally
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× go back to the western pressure plate, let the last tarbaby out and lure it all the way over and stand between the green doors when you kill it.
[Last edited by JLE at 10-09-2016 12:16 PM]