Trajan is a two player wargame covering the military campaigns of Roman Emperor Marcus Ulpius Nerva Trajan from 114 to 117 AD. The game is strategic in scale, with units representing Roman and Parthian forces, and their allies. The mapsheet, overlaid with a hexagonal grid, covers an area corresponding approximately to modern day Iraq, Iran and Kuwait.

Game components consist of mapsheet, counters, rules and game charts.