If you don't really (and I do mean really) understand tar and how it works, you might want to practice a bit before you try this room.
Tips:
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×If a passage is 2 or more squares long and 2 squares wide, don't bother trying to cut the tar in it.
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×It's usually a good idea to cut tar by the corners - the corner will turn into a baby and not more potentially uncuttable tar, and you can advance along the edge.
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×You can't cut 3-wide tar and live if you don't have room behind you.
It's a pretty nasty room. Good luck.
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Quick links to my stuff (in case you forgot where it was):
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