 The individual games represent various wars that took place on Chromos.The first three games are played on a hexagonal grid for a map.Players not only control the combat units (ranging from infantry and tanks to helicopters, fighters and bombers, armored trains, surface warships and submarines, stationary gun turrets), but (especially in the later games) also many support logistics units (ammo and fuel transports, scout and radar units, road and construction vehicles, and others).