A tactical level wargame on the battle of Sekigahara at the end of the Sengoku period. 激闘 関ヶ原 (Gekitoh Sekigahara) means fierce fight in Sekigahara. Each unit represents 400 soldiers. High lords or generals are included in some units. Players control either the Eastern army (Tokugawa) or the Western army (Ishida and Mori). Each army consists of many clans. Each clan are composed by a lord, generals and soldiers. In each turn, there are opponent's defensive fire step between movement and combat step. There are two types of combat, fire fight and melee , in both case, basic combat result is morale check. So unit's most important ability is morale. Not only undermining the troops of their clan, the loss of the lord also decreases army morale. Reduction of army morale reduces it's combat effectiveness. The game includes seven scenarios, two historical and five hypothetical. Winner is determined by elimination of opponent's highest lord or victory points based on elimination of units.