Happy Doomsday! (or HD!) is a computer game/information machine about the war culture as it has developed in Europe. HD! is made up of an installation with two units (fitness machine + computer + data projector + sound amplification). The opening interface is a 3D map of political Europe in 1999. By moving on the fitness machine the (two) users have an opportunity to do something about the present political situation and to change history into a personal story. The abstract level of the geography is then exchanged for a real-time 3D world, in which the visitors are influenced by each other and by the symbolic stories. The result is a win-win or lose-lose situation, in which both players have a physical and mental experience and practice political cynicism and personal commitment.