Fossilfuel is an adventure shooter with horror elements and a first-person view. The game begins in a research center located deep underground on one of the Alaskan islands. Scientists have created mutant dinosaurs, but one day the base is invaded by soldiers intent on stealing a valuable type of DNA. The main character must repel the attack of unwanted guests and survive among prehistoric creatures that have gotten out of control. In addition to fighting opponents, you also have to solve puzzles.