NUCA CTF - Case File Fr13

Some buildings skip the thirteenth floor. Some ships still refuse to leave port on a Friday. Nobody remembers why. They only remember that it is better not to ask.

Case Fr13 was opened on a Friday the 13th and closed before sunrise. The report says nothing happened. The file disagrees.

Inside it: a handprint on a surface no one was supposed to touch. A voice on tape that belongs to nobody on record. One frame from a camera that was switched off. In that frame, something is looking back.

Twelve people have signed this file out. All twelve returned it early, and not one of them wrote a line in the report.

On 16 November it is signed out to you. You are the thirteenth.

The deeper you dig, the more you wish you hadn't.

Senate Hall, 16 November. Teams of one or two. OSINT, GEOINT, Web, Reverse, Crypto, Forensics. Organized by NUCA with Google Developer Group, supported by HP & Coffee and Daily Cup.

How it works

Make it official.

Find your team.

Enter the competition and create or join a team before the start. Playing solo? Create a team of one.

Take on the challenges.

Solve together. Your reviewed team result and personal statistics will become part of your permanent profile.

Participation & rules

1. Teams: Maximum 2 players. Solo participation is allowed. No collaboration between teams or sharing flags.
2. Scope: Attack only designated challenge targets. Attacking NUCA/CTF infrastructure, other players, or external systems is strictly prohibited.
3. No disruption: DoS, excessive scanning, and attempts to interfere with the competition are prohibited.
4. AI: Only ChatGPT in a signed-out private window is allowed. No other AI models, coding agents, or automated AI solving. Use AI for guidance, not direct flag extraction.
5. Scoring: Fixed points, free hints. All results are subject to organizer review.
Rule violations may result in penalties or disqualification. Play fair and have fun!