Abstract: An adventure and simulated combat system in which a playing field is divided into a grid and in which the location of each participant within the system is identified by his location within a grid. A central control module includes visual surveillance, communication facilities and a central computer for controlling the system and scoring performance. Two-way radio communication of multiplexed signals at various power levels is extensively employed; and both synchronous and asynchronous modes control and communication are described. Both contact and line-of-sight weaponry are included, and accuracy of operation is provided through improved target discrimination and the utilization of multiple modes of detection of valid target strikes.