The Tartarus is a project used to introduce people to the experience of virtual reality. It is composed of two parts: the green plain above and the hellish underworld below. In addition to the ability to explore the virtual environment, the users also have control over the character Eva. We use her to show the concept of head-tracking as we can move her to the middle of the room and the users are physically able to walk around her. Another feature that can be shown is the sensation of falling. Users can step off from the bridge and fall into the underworld below.