Cytadela 4. 0 is a Polish-language, play-by-post role-playing forum set in the Mass Effect universe. Built around the Citadel and the wider galaxy, it offers members a shared setting for creating characters, joining stories, and exploring locations familiar from the series.

The forum provides practical tools for getting started, including a new-player guide, story and mechanics guides, and generators for character profiles and statistics. Players can submit character applications, browse accepted and rejected submissions, and find opportunities to join sessions or recruit a game master. Its community resources include character records, development statistics, non-player character profiles, galactic news, and TradeNet, alongside mission reports and archived recordings within the setting.

Members can also contact support, post notices, and seek other players. The setting spans destinations such as the Citadel, Omega, Illium, and numerous homeworlds and colonies, each with location-specific areas for play. With rules, resources, and community support alongside ongoing role-play, Cytadela 4.

0 serves as a collaborative hub for Mass Effect storytelling