You can learn about the three levers from a note that lies in one of the far adits of the quarry. You should notice a stone door with an image of a hand and three small steps in front of it. They symbolize three bolts.
Hurry up to get working codes for free sets with lots of free parts, weapons, a new armored car and other prizes.
The studio has acknowledged several failures in the past.
The project is multiplayer and free.