Nobunaga's Ambition: Sphere of Influence (JP) is the fourteenth main entry in the Nobunaga's Ambition series of strategy games by Koei Tecmo. This iteration is a port of the game released in 2013 and includes the Power-Up Kit expansion. A sequel titled Nobunaga's Ambition: Taishi was released in 2017.
Battles play a vital role in Nobunaga's Ambition: Sphere of Influence. Although it is not necessary for players to declare war to strengthen their position, enemy lords may attack castles, towns, and settlements to increase their area of influence and grow their wealth. Defeating enemy fiefs can also strengthen the overall standing of the player's chosen clan, a loyal army is key to successfully completing the game.
Nobunaga's Ambition: Sphere of Influence received "generally favorable" reviews from critics according to Metacritic with a current Metascore of 80/100.