Prey demo

Windows 2000/XP, 2GHz CPU, 512MB RAM, 64MB VRAM, 2.2GB disk space.
Publisher's description of Prey demo
This game is intended for adult audiences only. It contains graphic violence and profane language.Prey tells the story of Tommy, a Cherokee garage mechanic stuck on a reservation going nowhere. Abducted along with his people to a menacing mothership orbiting Earth, he sets out to save himself and his girlfriend and eventually his planet.
In Prey, players enter a living spaceship that enslaves alien races and devours humans for lunch. Prey turns the first-person-shooter genre upside-down with new gameplay features like wall-walking and gravity flipping, making for intense single- and multiplayer experiences. Prey is built on a heavily modified version of Doom 3 engine and is developed by Human Head Studios under the direction of 3D Realms.