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

[+] 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