We're an SCP server with working guns, keycards, and departments that you can actually apply for, like Scientific, Security, and Mobile Task Forces. You start out as a test subject, a Class-D, inside a secret underground facility run by the SCP Foundation.
The SCP Foundation's job is to Secure, Contain, and Protect anomalous SCPs that break the laws of nature. Scientists use Class-Ds for testing, Security keeps the test subjects under control, and Mobile Task Forces handle recontainment, hostile groups, and site security.
There are different paths you can take depending on what you want to do. Escape as Class-D and join the Chaos Insurgency, work for the Foundation as a scientist or guard, or take on dangerous operations with the Mobile Task Forces. If you do well enough, you might even get noticed by the Internal Security Department, which handles rogue personnel and traitors.
It's all about choosing your side and playing it out in the facility. Go along with experiments, try to escape, keep order, or help run the site from the shadows.