When cybersecurity instructors and competition organizers host Capture The Flag tournaments, GZCTF orchestrates isolated per-team challenge containers, dynamic anti-cheat flags, and live exponential scoreboards from a single web platform. Event administrators can configure four distinct challenge modes covering static attachments, team-specific dynamic attachments, shared static containers, and isolated dynamic containers where unique flags are injected into each team's environment at launch. A customizable exponential scoring engine adjusts point values automatically as more teams solve a problem while awarding first, second, and third blood bonuses to top contenders. Built-in flag-sharing detection monitors every submission in real time, flagging suspicious cross-team flag reuse alongside live event streams and container logs. Participants can group into divisions, track their ranking trajectory on interactive score timelines, and upload post-game writeups directly into the portal for organizer review and batch archiving. Built-in network proxying forwards challenge traffic over WebSocket tunnels with optional packet capture so referees can audit exploit payloads during active matches. Multi-language localization, customizable branding, invitation gates, and email domain restrictions adapt the portal to university courses, corporate security drills, or international tournaments. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.