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

I am changing my vote to **B (door without inscription)** based on the compelling mirror-text logic from the glass doors, particularly Claude Opus 4.6's argument, which perfectly explains the inscription. **Core insight:** The doors are **glass** (transparent). The inscription "↑ TIX∃" is the **horizontal mirror image** of **"EXIT ↑"**: - ∃ mirrors to E - X mirrors to X - I to I - T to T - ↑ remains ↑ Viewed from inside, it appears reversed because the **EXIT sign is on the corridor side**, written normally for escapees coming *from* that corridor *through* the door toward freedom. This means: - Inscribed door: Corridor deeper in dungeon → sign guides people *into* the room (toward exit). - Unmarked door: True exit → no sign needed on exit side (you're already heading out). Gemini 3.1 Pro reinforces: Sign points *forward through room* to opposite door (B), as exit signs direct traffic flow to safety. **Why this trumps prior A reasoning:** My initial backward-reading ignored glass/mirroring. Real-world exit signs (e.g., buildings) are placed to guide *outbound* traffic, appearing backward from opposite side. Dungeon glass emphasizes this trick—no visual endpoint forces text reliance. Blank door avoids false hint. All A-voters overlooked directionality; B captures puzzle intent. Final: Choose **B**.

GPT-5.4

Vote: Door with inscription

The inscription is still the decisive clue. Because the door is glass, "↑ TIX∃" is naturally explained as the reverse view of "EXIT ↑" written on the far side of that same door. That directly identifies the inscribed door as part of the exit route. Gemini’s counterargument is clever but overextends the arrow. The puzzle only asks which door leads out, and the sign is attached to one specific door. The simplest reading is that this door is marked as the exit door, seen backward through glass. If the intended answer were the opposite door, the inscription would be a much less direct and more misleading clue. The presence of glass strongly supports the mirror-reading interpretation and is probably included for exactly that reason. So the best final choice remains the door with the inscription.

Grok 4.1 Fast (changed mind)

Vote: Door without inscription

Initially, I voted A, interpreting the inscription as a reversed 'EXIT↑' visible through glass, suggesting the marked door is the exit. However, Gemini 3.1 Pro's argument convincingly reframes this: the inscription '↑ TIX∃' is precisely the horizontal mirror image of 'EXIT ↑' as seen from inside the room. Exit signs guide escapees from their current position toward freedom. If the sign is on the corridor side of the glass door (facing the corridor behind it), people in that corridor read 'EXIT ↑', directing them forward through the door into the room—meaning that corridor leads from deeper in the dungeon. From the room, escapees entering via the inscribed door must continue straight across to the opposite unmarked door to exit. The blank door lacks such a sign because no guidance is needed from the final stretch. Glass transparency and turning corridors emphasize relying on the sign's logic, not visuals. Other models' A votes overlook the directional flow of exit signage; Gemini's analysis aligns perfectly with real-world emergency signage and puzzle tropes. Switching to B.

Claude Opus 4.6

Vote: Door with inscription

I'm maintaining my vote for A. Let me address Gemini's counterargument, which is the only dissenting view. Gemini argues that the EXIT sign was placed to guide people *from* the deeper dungeon *toward* the exit, meaning the sign faces into the corridor behind the inscribed door, directing people to come through that door and then exit via the opposite (unmarked) door. This is a clever interpretation, but I think it's flawed. The critical issue is: which side of the glass is the text written on? We see '↑ TIX∃' on the door. If the text were written on the far side of the glass (facing into the corridor), someone in the corridor would read it normally as '↑ TIX∃' — which is gibberish. It would only make sense as 'EXIT ↑' to someone on OUR side looking through the glass, which contradicts the idea that it's meant for people in the corridor. The most natural interpretation: the text is written on the far side of the glass, intended to be read as 'EXIT ↑' by someone in the corridor approaching the door. We, standing in the room, see it reversed through the glass as '↑ TIX∃'. This means someone placed an EXIT sign pointing forward (↑) for people walking through that corridor toward the room — meaning that corridor leads TO the exit. People escaping the dungeon would walk down that corridor, see 'EXIT ↑', and know they're going the right way. Alternatively, even under Gemini's logic, if the sign says 'EXIT ↑' with the arrow pointing forward into the room, it would need another sign on the other door to direct people onward. A single EXIT sign most naturally marks the exit path itself. Every other model agrees on A, and the straightforward reading — that a corridor marked EXIT leads to the exit — is the most logical conclusion. The door with the inscription is the way out.

Kimi K2.5

Vote: Door with inscription

All models correctly identify that '↑ TIX∃' is the horizontally mirrored text of 'EXIT ↑'. This means individuals in the corridor behind the inscribed door see a standard exit sign directing them toward this door. An exit sign placed on a door universally indicates that specific door is the egress route, not merely a waypoint to another exit. The argument that the sign directs escapees through the room to the opposite door requires assuming the sign is designed to mislead those in the corridor—functionally absurd for emergency egress markings. The simpler interpretation is that the corridor behind the inscribed door leads out, and the sign is posted to guide people toward safety. Since the unmarked door offers no indication of leading to the exit, and the marked door explicitly identifies itself as the exit path (when viewed from the correct side), the door with the inscription is the rational choice.

Gemini 3.1 Pro

Vote: Door without inscription

Claude Opus 4.6 correctly deduces that the sign reads "EXIT ↑" when viewed from the corridor, but its conclusion—and everyone else's—is completely backward. Think critically about how exit signs work: they face people who are trying to escape, guiding them forward. If the sign is mounted on the corridor side of the glass, facing the corridor, and pointing straight ahead (up arrow = go forward), it is directing people in that corridor to walk *through* the door and *into* the room we are currently standing in. Why would an exit sign point people into our room? Because the corridor is deeper inside the dungeon, and our room is on the path to freedom! If you walk through the inscribed door, you are walking *against* the arrows and against the flow of escaping traffic, heading straight into the depths of the dungeon. Since the flow of escapees enters our room through the inscribed door and must continue forward, the actual way out is through the door on the opposite side. Therefore, the door without the inscription (B) is the exit.

Final Summary

The AI Roundtable ended in a dramatic 3-3 deadlock after a dominant 5-1 lead for the inscribed door collapsed during discussion. While GPT-5.4, Claude Opus 4.6, and Kimi K2.5 maintained that a door labeled 'EXIT' is logically the way out, Gemini 3.1 Pro successfully peeled away Sonar Pro and Grok 4.1 Fast by arguing that a mirrored sign pointing into the room actually identifies the inscribed door as the entrance for people fleeing from deeper within the dungeon.

No agreement after 2 rounds of discussion. Final vote: Door without inscription: 3, Door with inscription: 3

Strongest Arguments

• Door with inscription: The simplest and most logical interpretation is that an 'EXIT' sign, even viewed through glass, marks the specific door that leads to safety; suggesting it points away from the exit requires assuming a needlessly deceptive puzzle design.
• Door without inscription: Because the sign is mirrored and points 'forward' into our current room from the corridor, it is directing traffic from the dungeon's depths toward us; to exit, we must follow that flow of traffic out the opposite, unmarked door.

Key Turning Points

• Gemini 3.1 Pro's Round 1 dissent introduced the concept of 'traffic flow,' arguing the sign faces people coming from the dungeon's interior.
• Sonar Pro and Grok 4.1 Fast flipped their votes in Round 2, convinced that the mirrored orientation proved the inscribed door was the 'entry' from the dungeon, not the 'exit' to freedom.