Start you own oil extraction company with Petroleum game, explore with your thumper trucks for oil bags and send a exploration prove. Then drill & pump the oil to the surface, build trucks and sell at the best price to the oil refinery or store it to your silos waitting for future better prices. But be careful with your time limited land concession! - Underground: Petrol, Water, Rocks, Gas & Lava :) - Upgrade: pumpjack, trucks, silos, thumper trucks, drill, pipes,...