Ys IX: Monstrum Nox

Ys IX: Monstrum Nox
Ys IX: Monstrum Nox
Developer(s)	Nihon Falcom
Publisher(s)	NIS America JP: Nihon Falcom;
Director(s)	Takayuki Kusano; Hisayoshi Takeiri;
Producer(s)	Toshihiro Kondo
Programmer(s)	Hideyuki Yamashita; Noriyuki Chiyoda;
Writer(s)	Toshihiro Kondo; Yoshihiro Konda; Syunsei Shikata;
Composer(s)	Hayato Sonoda; Takahiro Unisuga; Yukihiro Jindo; Mitsuo Singa;
Series	Ys
Platform(s)	PlayStation 4; Stadia; Windows; Nintendo Switch; PlayStation 5;
Release	September 26, 2019 PlayStation 4 JP: September 26, 2019; NA: February 2, 2021; EU: February 5, 2021; AU: February 12, 2021; Stadia, Windows WW: July 6, 2021; Nintendo Switch NA: July 6, 2021; EU: July 9, 2021; AU: July 16, 2021; JP: September 9, 2021; PlayStation 5 NA: May 9, 2023; EU: May 12, 2023; AU: May 19, 2023; JP: July 31, 2025; ;
Genre(s)	Action role-playing
Mode(s)	Single-player

Ys IX: Monstrum Nox is a 2019 action role-playing game developed by Nihon Falcom. A part of the Ys series, it was released for the PlayStation 4 in Japan in September 2019 and worldwide by NIS America in February 2021. The game received additional releases for Windows, Nintendo Switch and Stadia in July 2021, and PlayStation 5 in May 2023. Ys IX received generally positive reviews from critics.