A simulation of global thermonuclear warfare. It all took place in one room, the only contact to the outside world was via telephone lines and a big screen, which showed the positions of missiles, cities, fleets and bombers.
Our first LARP that, in a way, was compliant with Dogma 99, (http://nordiclarp.org/wiki/Dogma_99). But more important, it was ahead of its time for many reasons. For the first time in Austrian LARP, we used a video game (DEFCON by Introversion) to enhance the experience of the players.
Furthermore, all player characters were actual historic figures, put into new context. Working gadgets like telephone lines and no need for game mechanics provided the background for maximal immersion and no restrictions were placed during the game on the participants.