CTF Write-up: “Instant Exposure”

1. Reverse image search via model screenshot

I began by examining the 3D model provided with the challenge. To facilitate identification, I took a screenshot at an appropriate angle that clearly captured the structure and its surroundings. Using this screenshot, I performed a reverse image search to gather visual matches on the web.

2. Initial geolocation discovery—Hamburg, Germany

One of the image matches led to an Instagram post showing the same photo booth, indicating that it was located in Hamburg, Germany. I confirmed this clue by carefully inspecting the poster pasted inside the booth, which matched details visible in the challenge image.

3. Cross-verification via TikTok

To strengthen the location confirmation, I looked for additional media evidence. I found a TikTok video featuring the same booth with the caption “Photomat—spotted in Hamburg” and the location tag “Schanzenviertel—Hamburg”, a known neighborhood in the city.

4. Identifying the nearby business—Schrødingers

In the TikTok video, the camera panned right, revealing a nearby sign that read “Schrødingers”. A quick search confirmed that Schrødingers is a cultural and event venue located within Schanzenpark, in Hamburg’s Schanzenviertel district.

5. Verification via Google Maps

Finally, I navigated through Google Maps around Schanzenpark and aligned the visual perspective to match the 3D model’s point of view. This confirmed the presence of the exact same Photomat, situated adjacent to the entrance of Schrødingers.

Final answer

As of October 2025, the business accessible through the nearby gate is Schrødingers, a cultural hub and event venue located in Schanzenpark, Hamburg.