Bug with an objective. "2 liquid elements extracting at the same time." I have extractors in both Br and Mg which are the only elements that are liquid at STP(which I assume you mean) yet it's saying I only have 1 and it's from the Br.
Why can I not place my second guard tower on the ground floor? It's the only place it will do any good, but it says I can't place it there, any other floor is fine.