You need to prevent the tar from getting out into the hallway, because otherwise even if you do kill the tar mothers, you won't be able to escape.
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×So, the first thing is to step on that trapdoor that is visible. After that move to the section on the left, where under the tar there are more trapdoors that can help you achieve your goal.
However, I am more concerned that you suddenly moved from asking for help on level 7 to asking for help on level 17. I was going to ask if you warped, but the warp room on 4 only takes you to levels 1, 6, or 7, so it can't be that. Did you finally beat that room on level 7, and zoom through 10 levels until this one room on level 17 started giving you trouble? I kind of doubt that as well. If you skipped level 8, by any method, you will be sorely lacking in the skills necessary to complete this level, as tar is introduced on level 8. I highly suggest you go back and complete that level, if you have not yet done so.
Game on,
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"
He who is certain he knows the ending of things when he is only beginning them is either extremely wise or extremely foolish; no matter which is true, he is certainly an
unhappy man, for he has put a knife in the heart of wonder."
-- Tad Williams