Subterranea is a side scrolling shooter. Your goal is to find the crystal treasure in a cave Hexuplex. Controlling your Ranger cave, you need to blow up different types aerobots, who guarded the cave. When all the boats on the level of the cave were destroyed, the passage opens, allowing you to travel deep into the cave. When you get to the last level of the cave, you can collect the crystal treasure and transported to the next (more complex) collection of caves and try a different crystal. In addition to the deaths aerobots, be sure to not crash into the walls of the cave; it will quickly drain your energy, especially if you fall into one of the skulls. When all of your cave Reserve Rangers crashed, the game is over. As you progress through the caves, they are narrowed and the enemies move faster.