Dynasty Warriors 9 pour Xbox One met de l'avant l'action emblématique de la série, « un contre des milliers ». Se déroulant à l'époque de la dynastie Han d'une Chine en déclin, quand les seigneurs de guerre se disputaient la domination, ce dernier opus de la série présente un vaste monde ouvert aux paysages variés.
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For the first time in the series, the expansive land of China is shown on a single map with the introduction of an open world format for diverse progression through the game. The 'one vs. thousands' exhilarating action of the Warriors series and the beloved characters from the Romance of the Three Kingdoms tale are carried over, but the freedom through an open world stage provides a brand new Warriors experience.
Critical Missions unfold and progress the story of the player character, and are supplemented by numerous missions from various regions such as Regular Missions that affect the Critical Missions and requests from other characters. The situation will be ever changing depending on what missions are selected. In the many battles that occur on the map, players will find a variety of strategies and tactics open to them such as "attacking head on," "launching a surprise attack from an elevated position" or "infiltrating at night", for numerous ways to enjoy the expansive world of the Three Kingdoms.