🎡 The fun continues! 🎡 Mark your calendar, we’re back July 17th–19th, 2026. It’s going to be another epic weekend! 🌼

DownUnderCTF is the largest online Australia and Aotearoa (NZ) run Capture The Flag (CTF) competition. This CTF aims to up-skill the next generation of Cyber Security Professionals and to grow the CTF community in the AUNZ region. DownUnderCTF is a completely free online event open to all participants around the world. Prize eligibility is restricted to Australian and Aotearoa (NZ) Secondary or Tertiary school students to encourage collaboration and healthy competitive spirit between the nations whilst also promoting cybersecurity skills to students.

With over 5000+ players and 2100+ teams in 2025 from complete beginners to seasoned CTF veterans, our diverse community is strong and we hope you can join us for 2026!

Show your interest here! https://ctftime.org/event/3112

We’ve just published the blog post for this year’s infra setup! 🔥 You can check it out here at https://downunderctf.com/blog/2025/infra-writeup/

And as promised, noCTF has now been open-sourced 📂 at https://github.com/noctf-project/noCTF

A huge shoutout to Justin Steven and our platinum sponsor Tanto Security for pen-testing our scoreboard, their contributions were truly invaluable to the success of the project. If you're curious, you can check out Tanto's blog post at https://tantosec.com/blog/2025/09/downunderctf-noctf-scoreboard-pentest-report/

Our digital vines have delivered the news! The prize winners of DownUnderCTF6 have been crowned! 🏆🦜

From phishing traps to logic leaps, these cyber-explorers conquered the wild!

A special shoutout to team [VuwCTF] empl*yment, who took 1st place in two prize categories! Talk about double trouble! 🥇🥇

Swing over to the prize winner graphic to see who made it out of the jungle with the treasure and check out our write up prize winners!

🏆 Best Writeup: siunam
https://siunam321.github.io/ctf/DownUnderCTF-2025/web/sodium/

🫨 Best writeup with unintended: Amogh E M
https://github.com/typicallhavok/CTF/blob/main/Writeups/DownUnderCTF/mutant.md

😆 Most entertaining writeup: sans175
https://saanrhyne.com/posts/grannie-writeup/

And one final thunderous thank you to our Platinum Sponsor this year — Tanto Security! 🐘✨ Like the mighty elephant leading the herd, Tanto stands tall in the jungle of greatness. They’re an incredible company you should definitely swing by and check out!

Explore more! -> https://tantosec.com/

✨ Write Up Prize submission form is now open! ✨

You've survived a wild 48-hour adventure deep in the hacking jungle... now it’s time to roar louder than the rest! 🐯🌿

Swing into action and submit your expedition logs for a shot at snatching the golden bounty—AUD$100—in one of these mighty categories:

🏆 Best Write-Up
🫨 Best Unintended Solution
😆 Most Entertaining Write-Up

But beware! The jungle gates close 27th July at 11:59pm AEST! Don’t miss your chance to leave your mark on the canopy!

Submit your write up here -> https://forms.gle/vA48AN5qgp8RFbrs8

DownUnderCTF 6 Challenges & Solutions:

https://github.com/DownUnderCTF/Challenges_2025_Public

And just like that… DownUnderCTF 6 has come to a close. 🌿
A huge thank you to everyone who took part — whether you replied to one or more emails or just vibed with E-Dog , we’re grateful to have shared another incredible 48 hours of puzzles, chaos, and creativity with you. 💚

We’re also pleased to report that the jungle server room has been heroically restored 🙏 and some new faces have moved in ❤️

We hope you enjoyed the adventure as much as we did running it!

CERTIFICATES
🎓 Don’t forget to grab your official DownUnderCTF 6 certificate — a shiny token of your exploration and skill
👉 https://certificates.2025.ductf.dev/

FEEDBACK
We would love to hear from you! Your experience, you ups or downs! Please share it with us at https://duc.tf/feedback🗒️

POST CTF SUBMISSION OF FLAGS
You can still submit flags - they will just not add to the scoreboard 🙂

TOP INTERNATIONAL TEAMS
The scoreboard finished strong with the following top international teams!
🥇 BunkyoWesterns
🥈 r3kapig
🥉 Kalmarunionen

And with the competition over, feel free to discuss challenges, share insights, or just hang out and decompress. You’ve earned it!

📬⏳ ONLY ONE HOUR LEFT — The Jungle is on the Brink! 📬⏳

The final vines are swaying, the monkeys are screaming (probably in binary), and DownUnderCTF 6 is down to its last wild hour! 🐒💻

Who will emerge from the foliage as victorious flag-hunters and email responders? There's still time to swing in with one last submission... or just take a deep breath, vibe with E-Dog, and let the jungle winds carry you. 🌴🎶

Remember: The tides of battle can shift faster than a caffeinated kiwi — anything can happen in these last moments! ⚡

Check your flags and refresh the scoreboard!

Check us out at https://2025.duc.tf/ and play now!

🚩 The flags are flagging… but not for long! ⏳

As DownUnderCTF 6 swings toward the final vines of closure, we want to take a moment to shine a massive spotlight (powered by jungle Wi-Fi) on someone who brought serious visual firepower to this adventure. 🔥🌿

🎨 Huge thanks to Serena for commissioning the absolutely epic graphics that gave this year’s CTF its wild, wonderful vibe! From the legendary E-Dog (woof!) to the pixel-perfect jungle server room, her artwork made the madness look as good as it felt.

Seriously — the E-Dog deserves its own animated series. 🐶💻💥

Want to see more of Serena’s incredible work? Of course you do. Check it out here:

Instagram/X - @deafrenitely
https://www.instagram.com/deafrenitely/
https://x.com/deafrenitely

There is still time to play -> https://2025.duc.tf