Well... to me this was kind of obvious as soon as I saw the picture, even if I never saw it before. Then again, I showed this to three other people and only one of them got it, and had to think about it for a while. So... I guess it's actually a good puzzle, and I'm just wired this way?
Edit: Welp, I just tried to see how it turned out with my group, and they told me they saw this in The Simpsons. Guess it's probably not gonna be an easy puzzle to add without everyone knowing it beforehand.Go to Comment
Fun puzzle. It seems like the disarming mechanism could be a little better thought out. "Touch this ring with the magnetic bar to lower the acid wall" just seems to be an odd way to disarm the acid wall. Either way, I love unconventional traps that make players think.
The player reaches through the acid wall, removes the stone, and gently lifts one end of one of the bars closer to the acid wall. The player can then place any metal object on her side of the acid wall to see if the bar and object pull towards each other. Since the acid wall doesn't negate the magnetism, they can test it without passing any object through the acid.