The Forbiden city is the fourth, and last world in the first Ct Special force. It involves Stealth Owl making the way through the city, and eliminating the Network's leader. The remnants of the Network were held up there before Stealth Owl's arrival. After completing the missions, two images will appear. One shows the helicopter flying off into the horizon, the second of numerous people with different weapons.(The same ones you use) These people are presumed to be part of the CT Special Forces.