RoyalRoppers presents
KongligCTF
A full day of on-site hacking, hosted by the CTF team of KTH Royal Institute of Technology.
Saturday 24 October 2026 · Cybercampus Sweden, KTH Campus, Stockholm
Boot sequence: competition starts Saturday 24 October 2026, 12:00 CEST (doors 11:00). Time remaining:
-days
-hours
-min
-sec
▶ Register your team (opens in a new tab)
Food & drinks provided. Registration closes 18 October 2026. Limited to 60 people, first come first served.
Register individually with a team name. Your would-be team members should register with the same (case-sensitive) team name
No AI, no LLMs.
KongligOS has quarantined ChatGPT, Claude, Copilot, and similar for the day. Using LLMs or AI assistants in any form during the competition is completely banned.
Device specs
KongligCTF is an eight-hour CTF with challenges in six categories, ranging from beginner-friendly to difficult. You do not need to be a KTH student. Students and other security enthusiasts of all skill levels are welcome.
- Event
- KongligCTF, an on-site jeopardy-style CTF
- Manufacturer
- RoyalRoppers, the CTF team of KTH Royal Institute of Technology
- Date
- Saturday 24 October 2026
- Uptime
- Doors 11:00 · Competition 12:00–20:00 CEST (8 h) · Awards ~20:30
- Install location
- Cybercampus Sweden at KTH Campus, Valhallavägen 79, 114 28 Stockholm
- Drivers loaded
- pwn · rev · web · crypto · forensics · misc
- Users
- Teams of up to 4; solo play allowed; all skill levels
- License
- Free, with food & drink provided
- Achievements
- Prizes for the top 3 teams
# challenge_preview.sh
guest@kongligos:~$ cat /etc/motd
Welcome to KongligCTF. 8 hours. 6 categories. 1 crown.
guest@kongligos:~$ sudo seize --crown
Sponsors
The royal treasury, generously funded by. Every card opens the sponsor's website in a new tab.
Gold tier (1 items)
Silver tier (3 items)
Cparta
Trusted cyber defense for critical sectors.
(opens in a new tab)
Zyner
Server hosting for non-profit organisations
(opens in a new tab)
Cybercampus
The Swedish research initiative for cybersecurity.
(opens in a new tab)
Want to sponsor KongligCTF? Get in touch → styrelse@royalroppers.team
rules.txt
This text serves as definitive rules for the competition. Failure to follow these rules will result in penalities or suspension.
Teams
Do not share flags, solutions, hints with other teams whilst the event is running. Only teams up to 4 allowed (solo play allowed)
Fair play
Don't attack the infrastructure or scoring platform, other teams, or anything outside challenge scope. Do not brute-force flags, or run DoS attacks unless the challenge has specified so.
No AI / LLMs
Using LLMs or AI assistants (ChatGPT, Claude, Copilot, and similar) is completely banned during the competition. Any violation means disqualification.
Flag format
Flags follow the following format like konglig{...} where the dots follow the following regex: [a-zA-Z0-9_åäöÅÄÖ*]. The challenge may states other regex for flags.
Scoring
Dynamic scoring: every challenge starts at 500 points and decays with the number of solves. Ties are broken by earliest final submission.
Disputes
Organizers' decisions are final. Questions during the event go to the admins on-site or the event Discord.