The PolyU CTF Qualifier 2025/2026 will be held on 3-Oct-2025 to 5-Oct-2025. It will be a 48-hour jeopardy-style online CTF event. Same as last year, we will have prizes for the top-3 contestants! For more information, please visit the CTF Qualifier page, or refer to the following poster: See you on the competition day!