Hint:
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×You want as little tar growth as possible, so make sure you don't remove anything that may be useful later. Remember that the tar itself can also act as a barrier to further baby formation.
More spoiler-ish hint:
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×The orbs toggle the doors, so you can use them as part of the tar "container" to hold all the tar in.
Also...
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×You will need to brush up on brain directed horde manipulation for this one. Stepping is an integral component of this solution. Try to kill and advance at the same time.
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Resident Medic/Mycologist