Notifications

LINE CTF 2025 is now over! Thank you for joining and competing in this year’s LINE CTF. We hope you enjoyed the challenges and learned something new along the way!

[Result]

🥇 (1st place) — The Duck
🥈 (2nd place) — GMO Ierae
🥉 (3rd place) — Odin
4: full_weak_engineer / 5: r3kapig / 6: FermionAlp / 7: Super Guesser / 8: Friendly Maltese Citizens / 9: Trixter / 10: HyperSonic

As stated in the rules, the top 3 teams must submit your write-ups to [email protected] by 2025.10.22 09:00 (UTC+9). Please don’t forget to send them on time!
After we finish checking the write-ups, the final scoreboard will be published on CTFtime.

[Notice]

All challenge servers will remain accessible for 72 hours after the end of the CTF. (Please note that some challenge instances may experience temporary downtime due to resource adjustments.)

[Final Words]

Once again, thank you all for participating in LINE CTF 2025. We truly appreciate your enthusiasm, effort, and creativity — see you again next year!

The competition is almost over — only 1 hour left until the end of LINE CTF 2025!
Make sure to submit your final flags before time runs out.
Good luck, everyone!

Before you dive into the real challenges, let's do a quick sanity check to make sure flag submission is working:

1. Flag format: LINECTF[0-9a-f]{32}}
2. The flag for this challenge is hidden in the topic of the CTF Discord announcement channel.
3. Your task: find it, copy it, and submit it to the scoreboard.

The wait is over! LINE CTF 2025 is now live. Join the challenge, test your skills, and compete with the best minds around the world. Good luck, hackers!

Please wait just a few more minutes!

The system may be unstable at first as many participants try to register simultaneously. Please register early to avoid any issues.