The Insurgent is one of the four Master Challenges of Shadow Complex. It involves completing the game with only 4% of all items, these four percents being the Flashlight, Backpack, Grenades, Foam and Missiles.
The challenge leaves no room for mistakes as some areas are only accessible before a certain event.
You need to be at least level 30 to do this challenge, as unlimited foam is required to navigate around the complex without any of the other movement-altering upgrades. It's also recommended that you have all Gold Bars, to unlock the gold weapons room which gives you access to the Inertial Element.