Dynasty Warriors 9 is a hack and slash video game developed by Omega Force and published by Koei Tecmo. It was released for PlayStation 4 in Japan on February 8, 2018, and for PlayStation 4, Xbox One and Microsoft Windows in Western markets on February 13, 2018.
Dynasty Warriors 9 is a hack and slash game played from a third-person perspective with stealth elements. The game revamps the gameplay of the series with the introduction of the open world environment. A traversable map of China is implemented which the player can freely roam on foot, horseback or boat, the game focuses on livable environments such as cities and towns as well as places where large battles take place. The characters' move-set combinations is also revised.
The player can invade and infiltrate enemy fortifications with the utilization of a grappling hook. A day-night cycle and dynamic weather system is also featured in the game. Time and weather now change in real time, and enemy vision is affected at night-time or when it is raining. The map will advance in time when main story missions are completed, but are described as having a "high degree of difficulty" which can be lowered by completing associated side missions.