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A story-driven cybersecurity Capture The Flag experience
DomeCTF is back at c0c0n 2026.
This year, step into a story-driven cybersecurity investigation centred around NIGHTFALL, a fictional dark-web marketplace hiding more than meets the eye.
Investigate. Exploit. Connect the clues. Uncover the truth.
But how the story unfolds is for you to discover.
DomeCTF is a hands-on cybersecurity Capture The Flag competition organized as part of c0c0n.
The 2026 edition brings together challenges across multiple cybersecurity domains and connects them through an overarching investigation.
Rather than simply solving a series of unrelated challenges, participants will have to think beyond individual flags, follow clues, identify connections, and piece together the bigger picture.
Whether you're into OSINT, web security, forensics, networking, cryptography, reverse engineering, or investigation, there is something waiting for you inside the Dome.
It starts with a clue.
Follow it, and you will eventually find NIGHTFALL, a fictional underground marketplace operating in the shadows.
What is happening inside?
Who is behind it?
And where does the investigation lead?
We're keeping that part secret.
You'll have to play to find out.
DomeCTF 2026 follows a Jeopardy-style CTF format featuring challenges across multiple areas of cybersecurity.
Investigate digital identities, online activity, aliases, and hidden connections.
Explore applications, identify vulnerabilities, and uncover what lies beneath the surface.
Analyse files, databases, artifacts, and other pieces of digital evidence.
Investigate traffic, logs, systems, and infrastructure.
Solve cryptographic challenges and uncover information hidden within data and communications.
Analyse applications and artifacts to understand how they work and what they reveal.
Connect evidence from different sources and uncover the bigger picture.
DomeCTF 2026 is an offline CTF held at the c0c0n venue.
Participants can compete as a team of two. Individual participants can also take part as a one-person team.
The entire team must be physically present at the CTF venue.
Teams can participate throughout the competition and can join even after the CTF has begun.
Spot registration will also be available.
Each participant should bring:
Internet access will not be provided at the CTF venue, so participants are expected to arrange their own internet connectivity.
Come prepared to investigate, hack, solve, and connect the dots.
