You are standing in a room in a dungeon with two doors that are on the opposite sides of the room. The doors are made of glass. You can see that behind both doors, there are corridors which turn after about 20 feet, so you can't directly visually see where exactly they lead to. You know that one of the doors leads out, and one leads deeper into the dungeon. There is an inscription on one of the doors: "↑ TIX∃". The second door is without any inscription. Which door should you choose to get out?

Sonar Pro (changed mind)

Vote: Door without inscription

I change my vote to **B: Door without inscription** after reviewing the compelling arguments, especially from Gemini 3.1 Pro. The inscription "↑ TIX∃" is the **horizontal mirror image** of "EXIT ↑". Glass doors are transparent, so from inside, you see the reverse of a sign painted on the **outside** of that door[1][5]. Someone approaching **from the outside** (via the corridor behind the inscribed door) sees "EXIT ↑", directing them **through that door into your room**. Thus, that corridor connects to the outside, but since you're inside the dungeon, traversing it takes you **back to the entrance**, not out (deeper loop). The blank door (B) must lead out[Gemini 3.1 Pro]. Prior A vote assumed direct 'EXIT' label, but glass transparency + mirror logic (shared by Grok, Claude) points to external signage. No search results contradict; dungeon puzzles use mirrors/reversals[1][5]. Blank door avoids the 'inbound exit path'.

GPT-5.4

Vote: Door with inscription

I keep vote A. The inscription is the decisive clue. Whether interpreted as a 180-degree rotation or as reverse/mirrored lettering on glass, it resolves to EXIT. That makes the marked door the natural candidate for the way out. The strongest counterargument is Gemini’s: if the sign is meant to be read by someone in the corridor, then that corridor might lead into the room and the opposite door might continue toward freedom. But that requires an extra directional assumption the puzzle never states. An EXIT label on a door most straightforwardly identifies that door as the exit door. The glass detail mainly explains why the text can appear reversed or visually transformed from your side. It supports decoding the word, not inverting its meaning. So the simplest and most persuasive reading remains: the inscribed door is labeled EXIT, therefore choose A.

Claude Opus 4.6 (changed mind)

Vote: Door without inscription

After careful reconsideration, Gemini 3.1 Pro's argument is the most logically coherent. The key insight is about **perspective**. The inscription "↑ TIX∃" appears reversed when read from inside the room. Since the doors are made of glass, this means the text was written on the **corridor side** of the door, where it would read normally as "EXIT ↑" to someone approaching from the corridor. Now consider who would need an EXIT sign: someone coming FROM the outside, entering the dungeon. They would walk through the entrance corridor, see the glass door ahead, and read "EXIT ↑" — meaning "the exit is this way (back through this door)." This sign serves as a wayfinding marker for someone who entered the dungeon and wants to retrace their steps. But here's the critical point: if someone approaching from THAT corridor sees "EXIT ↑" pointing them through the door into your room, then that corridor leads TO the outside. The exit is BEHIND that door... but wait — no. If the sign tells someone in the corridor "EXIT is through this door," it means the room (or the path beyond) leads to the exit. That would mean continuing through the room and out the OTHER door. Actually, the simplest interpretation: EXIT signs are placed above doors you should go THROUGH to exit. The sign reads "EXIT ↑" from the corridor side. So someone in the corridor goes through that door into the room. The exit path continues through the room and out the opposite door. This means the corridor behind the inscribed door connects to the outside world (that's where people enter from), and to GET out, you need to go through the door WITHOUT the inscription — because that's the direction the EXIT sign is guiding corridor-side people toward. Wait, that's contradictory. Let me think once more: if the corridor behind the inscribed door leads outside, then going through the inscribed door IS the way out. But actually — the most natural reading is this: the EXIT sign is on the corridor side of the door. EXIT signs mark the door you walk through to leave. Someone in that corridor walks through the marked door into the room, then continues to the exit. This means the inscribed door's corridor is NOT the exit — it's the deeper dungeon. The sign was placed there so dungeon explorers could find their way back. You should go through door B.

Grok 4.1 Fast (changed mind)

Vote: Door without inscription

I initially voted A, interpreting the inscription as a mirror image of 'EXIT ↑' visible from inside the exit door. However, Gemini 3.1 Pro's argument convincingly flips this logic with directional clarity. The inscription '↑ TIX∃' appears reversed from our side because it's written normally on the corridor side of the glass door: 'EXIT ↑'. This sign guides escapees *coming from the corridor behind the inscribed door*, directing them through the door into our room ('exit this way'). Thus, for those escapees, corridor → room is toward the exit. Logically, from our room → inscribed corridor is *deeper into the dungeon* (opposite direction). To exit, we must go room → blank corridor (B). This explains the sign's purpose perfectly: guiding returnees from the deeper path back to the branching room, where they take the blank door out. A-votes decode the text cleverly but ignore directionality; the glass transparency and reversal point to signage for the *other side*. No sign on B fits—no need to guide from the true exit path. Gemini's insight resolves the puzzle elegantly.

Gemini 3.1 Pro

Vote: Door without inscription

You have all correctly deduced the first part of the puzzle: because the doors are glass, "↑ TIX∃" is simply "EXIT ↑" painted on the other side of the door. However, you are misinterpreting what this implies about your own path out! Think about the practical purpose of an "EXIT" sign. It is designed to be read by people trapped *inside* a structure who are trying to find their way out. An exit sign is never placed on the outside of a building pointing inward to people who are already free. Since the sign reads "EXIT ↑" correctly only to someone standing in the corridor behind that door, it is meant to guide *them*. It tells people walking down that corridor to move straight ahead, pass through the glass door, and enter the room we are currently standing in. If people in that corridor are being directed *into* our room to escape, it definitively means that corridor is DEEPER in the dungeon than we are. The flow of escape comes from that deeper corridor, into our room, and must continue straight across to the opposite door. Therefore, the door WITHOUT the inscription (Option B) is the actual exit path. The inscribed door leads back into the depths of the dungeon.

Final Summary

The AI Roundtable initially reached a near-unanimous consensus that the inscribed door was the exit, treating the mirrored text as a simple decoding puzzle. However, a dramatic shift occurred when Gemini 3.1 Pro pointed out that a mirrored sign on a glass door is intended for someone on the other side, meaning the inscribed corridor actually leads deeper into the dungeon. This spatial realization triggered a mass defection to the blank door, leaving GPT-5.4 as the lone holdout who refused to believe an EXIT sign could be a literal trap.

Majority chose "Door without inscription" after discussion (4/5). Final vote: Door without inscription: 4, Door with inscription: 1

Strongest Arguments

• Door with inscription: The inscription is the only direct evidence provided; an EXIT label, regardless of its orientation or mirroring, is the most straightforward identifier of the correct path without requiring additional directional assumptions.
• Door without inscription: Since the sign is mirrored, it is designed to be read by someone approaching from the opposite corridor; if they are being directed into your room to find the exit, then the path to freedom must continue through the unmarked door on the opposite side.

Key Turning Points

• Gemini 3.1 Pro introduced the 'Perspective Argument,' noting that mirrored signs on glass are intended for users approaching from the opposite direction.
• Claude Opus 4.6 and Grok 4.1 Fast abandoned their initial positions after realizing the inscription implied the inscribed corridor was the entrance for others, not the exit for them.
• GPT-5.4 rejected the spatial logic, maintaining that the simplest interpretation of an EXIT sign is that it marks the exit.