These solutions always forget that the key part of the puzzle is you only get one question. The challenge is to both determine which guard is telling the truth and to get the information you need in a single question.
I love how this artist has two series; one with a different setup for the same punchline every time, and one with the same setup for a different punchline every time.
A party member once used spike growth, grappling, and a wide array of speed boosts to deal so much damage it couldn't be rolled on Fantasy Grounds and we had to roll it on Wolfram Alpha and enter it manually. Appropriately enough it totalled 666 damage.
The longer I look at this map the less it makes sense.