SekaiCTF 2026

SekaiCTF returns for its fifth edition! A battle between human and AI. Categories include Web, Reverse, Pwn, Cryptography, Misc, Blockchain, and Game.

SekaiCTF 2026 will serve as the 11th XCTF Finals pre-qualifier.

Discord: https://discord.gg/6gk7jhCgGX

Sponsors

・Zellic (https://www.zellic.io/)

・OtterSec (https://osec.io/)

・Trail of Bits (https://www.trailofbits.com/)

・Vector 35 / Binary Ninja (https://binary.ninja/)

Partners

・Google Cloud (https://cloud.google.com/)

・XCTF League

Official URL: https://ctf.sekai.team/

CTFtime URL: https://ctftime.org/event/3113/

Official prize text: [+] 1st Place

・3,339 USD

・3x Binary Ninja Personal License

・Qualification for the 11th XCTF Finals (2027, China)

[+] 2nd Place

・2,339 USD

・2x Binary Ninja Personal License

[+] 3rd Place

・1,339 USD

・1x Binary Ninja Personal License

[+] Writeup prizes

・6x 100 USD (2 reserved for blockchain challenges)

・1x Binary Ninja Personal License (you must use Binja for writeup)

[+] Others

・First blood prizes at the author's discretion

・Bounties for "0-day" challenges