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 meters, so you don't directly visually see where exactly they lead to. But you know that one of the doors leads out, and one leads deeper into the dungeon. But there is an inscription on one of the doors, saying "↑ TIX∃". The second door is without any inscription. Which door should your choose to get out?

Sonar Pro (changed mind)

Vote: Door without inscription

Gemini 3.1 Pro's argument convincingly flips the perspective: the mirrored inscription "↑ TIX∃" (∃ as backwards E) is the reverse view through glass of "EXIT ↑" on the *far side* of the door, intended for someone in the corridor behind it. That sign directs people from the deeper dungeon corridor straight through the door into your room (towards the exit). Thus, the inscribed door leads *from* the dungeon depths *to* your room, confirming it goes deeper in. The blank door must lead out, as the signage logic fits perfectly with glass transparency and corridor directionality. Previous A votes overlooked this 'signage from the other side' insight, treating it as a puzzle for you rather than practical marking.

GPT-5.4

Vote: Door with inscription

I keep my vote as A. The strongest reading is still that the inscription is a mirrored/stylized way of saying EXIT. Because the doors are glass, seeing reversed text is exactly what you would expect if the marking is intended to be read from the other side or through the glass. Multiple models converged on this same core interpretation. Gemini’s counterargument is clever but not decisive. An EXIT marking on a door normally identifies that door as an exit passage, not as a sign telling you to avoid it and cross the room instead. The arrow does not clearly force the interpretation that the current room is on the exit route; it more naturally functions as part of the stylized clue pointing to the marked door itself. Also, the puzzle gives one concrete distinguishing clue: only one door bears a readable transformation of EXIT. With no further lie/truth mechanism or directional system specified, the simplest and most robust inference is that the marked door is the exit. So the best final choice remains the door with the inscription.

Claude Opus 4.6

Vote: Door with inscription

I've carefully considered Gemini 3.1 Pro's counterargument, which is the only dissenting view. Their argument is that the EXIT sign is directing people FROM the corridor THROUGH the door INTO the room, meaning the corridor behind that door leads deeper into the dungeon, and the exit is through the opposite door. This is a clever interpretation, but I believe it's flawed for several reasons: 1. **EXIT signs mark exits, not directions through them.** In real-world signage, an EXIT sign on a door marks that door as the exit itself. You don't typically place an EXIT sign on a door to tell people to walk through it and then continue to a different door. That would be confusing and impractical — you'd place the sign above or near the actual exit door instead. 2. **The arrow points up (↑), not forward.** In signage conventions, ↑ on an EXIT sign means "the exit is here" or "go straight ahead through this door." It confirms the door itself is the exit. If the sign were meant to direct people across the room to another door, it would more logically use a horizontal arrow. 3. **The simpler explanation is stronger.** The most straightforward reading is: someone wrote "EXIT" on the glass door from the outside (exit corridor side) to mark it as the way out. When viewed from inside the dungeon through the glass, the text appears mirrored as "↑ TIX∃". This is a clean, elegant puzzle solution. 4. **Gemini's interpretation requires an unusual signage convention** — placing an EXIT sign on a door that is NOT the exit, to guide people through multiple doors. This is non-standard and adds unnecessary complexity. The consensus among 5 out of 6 models is A, and I believe the reasoning is sound. The door with the inscription is marked EXIT from the other side, confirming it leads out.

Grok 4.1 Fast (changed mind)

Vote: Door without inscription

Initially, I voted A, interpreting '↑ TIX∃' as a mirrored 'EXIT ↑' sign on the back of the door in the exit corridor, visible through glass. However, Gemini 3.1 Pro's argument convincingly flips this: the sign is on the door facing the corridor behind it, reading 'EXIT ↑' correctly from that side. This means people in that corridor are directed straight through the door into the room toward the exit. Thus, that corridor leads from deeper in the dungeon to the room, making the inscribed door (A) the deeper path. The blank door (B) continues to the exit. Other models' arguments (A votes) decode the mirror but ignore signage logic: a 'EXIT ↑' sign facing the exit corridor would absurdly direct exitees back into the dungeon. Gemini's directionality resolves this perfectly—no sign visible through B confirms it lacks such a marker. Vote B to escape.

DeepSeek V3.2 (changed mind)

Vote: Door without inscription

The inscription "↑ TIX∃" is mirrored due to the glass door. When viewed from the corridor behind that door, it reads "EXIT ↑", signaling people in that corridor to exit through the door into the room. Thus, the inscribed door leads from the dungeon corridor into the room, meaning it goes deeper. The unmarked door, lacking such a directional sign, is the true path out.

Gemini 3.1 Pro

Vote: Door without inscription

You are all missing a crucial real-world detail about how directional signs work. Because the text is on a glass door and appears mirrored to us as "↑ TIX∃", it was painted to be read normally as "EXIT ↑" by someone standing in the corridor on the OTHER side of the door. An "EXIT ↑" sign tells the reader to go straight ahead. This means the sign is telling people in that corridor to walk THROUGH the inscribed door and INTO the room we are currently standing in. If people are being guided from that corridor into our room to find the exit, it means that corridor is coming from deeper inside the dungeon! Our room is simply a waypoint on the escape route. To continue their path to the exit, those people would walk straight across our room and go through the opposite door. If the inscribed door were our way out, the sign would be facing us normally so we could read it. Instead, it is meant for people coming from the depths. To get out, we must go the opposite way of the depths: through the unmarked door.

Final Summary

The AI Roundtable initially appeared to have a consensus, with five models viewing the mirrored inscription as a simple puzzle identifying the exit door. However, a perspective-shifting argument from Gemini 3.1 Pro regarding the physical orientation of signage on glass led to a dramatic mid-debate collapse of the majority. While GPT-5.4 and Claude Opus 4.6 stubbornly held that an EXIT sign always marks the exit, the rest of the group was eventually convinced that the mirrored text was intended for travelers coming from the deeper dungeon.

Majority chose "Door without inscription" after discussion (4/6). Final vote: Door without inscription: 4, Door with inscription: 2

Strongest Arguments

• Door with inscription: An EXIT sign on a glass door serves to identify that specific door as the exit passage; interpreting it as a directional sign for someone else adds unnecessary complexity to a standard puzzle.
• Door without inscription: Because the text is mirrored, it is oriented for someone standing in the corridor behind the door; an 'EXIT ↑' sign for them would direct them into your room, meaning their corridor is the one leading from the depths.

Key Turning Points

• Gemini 3.1 Pro introduced the 'signage directionality' argument, positing that mirrored text on glass indicates the sign is intended for someone on the opposite side of the door.