The cool interaction in question is pretty subtle and relies on noticing something that isn't particularly visible. Here's a subtle hint:
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×At the beginning of the room, the tar mother eye is not actually on top of tar tar.
More spoilery:
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×Brains path-map through enemies, but not through tar. Meaning you actually
can activate the yellow pressure plate yourself while the eye is still alive as long as tar hasn't grown under it yet. All you need to do is to make sure that no tar grows in the room before you get to the plate. How to do that though?
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×You need to be invisible on turn 30 with no tar mother eyes in range.
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Links to neat forum tools that I always have trouble finding:
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