Nier Reincarnation was a 2021 role-playing video game developed by Applibot and published by Square Enix for Android and iOS devices. The game is a sequel to Nier, forming part of the wider Drakengard series. Set in a realm called the Cage, the game followed the story arcs of multiple characters, each exploring their troubled pasts while manipulated by a greater outside threat. Gameplay was split between exploration within the Cage and narratives dubbed Weapon Stories, and turn-based battles against monsters infesting the Weapon Stories. The game was free-to-play, incorporating a gacha-based system for character variants and weapons.

Nier is a 2010 action role-playing video game developed by Cavia and published by Square Enix for the PlayStation 3 and Xbox 360. In Japan, the game was released as Nier Replicant for the PlayStation 3 with a younger main character, while an alternative version titled Nier Gestalt with an older main character was released for the Xbox 360; Gestalt was released outside of Japan as Nier for both platforms. A remaster of the Japanese version, Nier Replicant ver.1.22474487139... was released worldwide for PlayStation 4, Xbox One, and Windows in 2021.