![Oil Processing and Refineries](/data/gallery/4/1/5/c/2/39-50.jpg?v=1605706136)
Oil Processing and Refineries
![](/data/uploads/GameIcons/IconDesc_OilRefinery_256.png)
Unlocking the Oil Processing milestone gives access to the Oil Extractor and the Refinery. I'll explain how Refineries work and how they have dual inputs and outputs and how you need to manage them.
![Space Elevator](/data/gallery/f/1/8/0/a/82-50.jpg?v=1605729100)
Space Elevator
![](/data/uploads/GameIcons/SpaceElevator_256.png)
The Space Elevator is how you unlock the technology tiers in the game.