This is a tough room.
Have you noticed the arrows underneath the south and western sections of gel, and the arrow turners? Well, I hope so, anyway.
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With clever timing it's possible to destroy the gel that is on top of the arrows. The gel is then permanently blocked, as it cannot regrow over the arrows.
However, this introduces a new problem...
That should be enough to get you started - let me know if you want any more help.
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Quick links to my stuff (in case you forgot where it was):
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