KalmarCTF 2026 is officially over — and what a weekend it was 🎉

Huge congratulations to this year’s top teams!

Hack with us tonight and all weekend at KalmarC.TF 🚀

KalmarC.TF is back for its 4th year!

Join us at https://kalmarC.TF for a weekend of hacking, learning, and fun.

As always, we have some great prizes up for grabs, including Hex-Rays IDA licenses and prizes from Zellic.

Kalmarunionen finishes #2 in the world on CTFtime 2025 - marking three consecutive years in the global top 3!

• 🥉 2023: 3rd
• 🥇 2024: 1st
• 🥈 2025: 2nd

✨ A Thrilling Season

Staying at the very top of competitive hacking year after year is harder than getting there once. The global field keeps getting stronger, the formats …

This weekend, Kalmarunionen set out to win Hack.lu CTF — a great competition that’s been running for 15 years, hosted by the German team fluxfingers from Ruhr University Bochum.

After finishing 2nd place in both 2023 and 2024, we were determined not to let history repeat itself. We started strong, held the top …

Fourth time’s the charm!

After years of competing and qualifying through Google CTF — where the top 8 teams earn a place in the Google Hackceler8 finals — Kalmarunionen took home the Hackceler8 2025 trophy and cash prize in Mexico City!

This year, a dedicated group went all in on preparation for the finals — and …

It came down to the wire. Other amazing teams like Maple Bacon, Shellphish, and especially BunkyoWesterns and r3kapig pushed us right to the last minute. That pressure is exactly why we are playing the hardest CTFs in the world.

This is our fourth ASIS CTF win, and it’s a reminder that the top is never …

Our team went all in at Google CTF 2025 and crossed the finish line in second place, securing 37.000 DKK, and for the fourth time - a ticket to the Google Hackceler8 Finals, this year held in Mexico City.

We were proud that the Minister for Digital Affairs (Digitaliseringsministeriet), Caroline Stage Olsen, accepted …

This weekend, Kalmarunionen gathered physically for another meetup at Eupry in Copenhagen for an intense and fun-filled hacking meetup - joined by several of our teammates chiming in remotely! 🧠⚡

While we were initially prepping for two bigger CTFs that unfortunately got postponed, we quickly adapted and dove headfirst …

🎉 Kalmarunionen is back with another electrifying edition of #KalmarCTF! 🎉

Last year was a blast, and we’re dialing it up yet again. Mark your calendars for March 7th - March 9th, 2025 – 48 hours of relentless hacking, mind-bending challenges, and a battle for ultimate CTF glory.