arquake is a modified version of quake from id software, designed for play outdoors using augmented reality technology. augmented reality is where a user wears a head mounted display (sorta like virtual reality goggles you've seen in movies), and the user can see both the quake game, and also the real world at the same time. we modified quake to take its view information from a gps and orientation sensor, and so as you walk around, quake moves in sync with the real world. monsters and buildings appear to sit in the real world as though they were really there, and then you can play a game of quake while you are in the real physical world.