The most significant difference with the new exam format is that it is proctored. This means that you are being watched over your webcam for the entire period of the session. Proctoring a five-day exam is impractical, so the exam was split into three six-hour sessions. Each six-hour session consists of three individual “challenges”. Each challenge involves recovering the contents of a secret file, but some challenges will require hacking more than one machine. You enter the contents of the file into a web page and submit it when you are done with the session. You must complete at least one challenge per session, and you must complete at least five out of the nine sessions to pass the exam.