About

x3CTF is a cute little jeopardy-style CTF with web, pwn, rev, crypto, and misc challs!

x3CTF 2025 (feat. mvm) will run from Jan 24th 18:00 UTC until Jan 26th 18:00 UTC (48h). Be here a few minutes early for a fun surprise ^_^.

Check us out on CTFtime and join our Discord server.

MVM

We're teaming up with MVM to accept community-submitted challenges. Submit a challenge here.

Prizes

List of prizes:

• iPad
• iPod
• iPhone
• Android phone for every person on the team (while supplies last)
• Thinkpad (with socks and cat ears)

The prizes are still being determined, so the list and conditions may still change. More information to come. Prizes will be signed.

Each winning team will be able to pick one prize in scoreboard order. There will probably be alternate prizes for those who can't or wish not to receive a prize physically.

We reserve the right to not send out a physical prize if shipping it would be prohibitively difficult or expensive (shipping costs over 50€ will be decided on a case-by-case basis).

Rules

1. You are allowed to play either individually or with a team. When playing with a team, register and use a single account for the entire team.
   1. If playing on a team, you are allowed to also have 1 personal account, but you are not allowed to submit flags on the personal account.
2. There is no bruteforce or scanning of public infrastructure required to solve the challenges.
3. Attacking or abusing the organizers infrastructure is forbidden.
   Valid challenge targets are located at:
   1. https://<UUID>.x3c.tf​:1337
   2. https://<UUID>.x3c.tf​:31337
   3. instances.x3c.tf:30000-65535 (tcp/udp)
4. Have fun!

Note: The rules are still being determined and may change before the CTF begins.

Credits

The x3CTF team consists of Coderion, DagurB, Raptor, rdx4.2, Rebane, and ShadowCone.
We're using the Berg CTF Platform by NoRelect, with a custom frontend by Rebane.
Thank you to all the MVM contributors for submitting additional challenges: alex_hcsc, boxmein, hackrrr, joneswastaken, ksaweryr, natan.p, and xtea418.
Music: ??? (surprise!)