Hollow Knight is a 2017 action-adventure game developed and published by Team Cherry, and was released for the Nintendo Switch in 2018.

The game follows a nameless knight, (commonly referred to as "ghost" or "the knight" by fans) as they traverse an ancient, plague-infested kingdom inhabited by various insects, known as Hallownest. The Knight must travel through Hallownest, fighting bosses and unlocking new abilities to progress, as they uncover the mysteries of the kingdom. Hollow Knight was well received by critics and has sold over 3 million copies as of December 2020.

Hollow Knight is a 2D Metroidvania action-adventure game, that takes place in Hallownest, a fictional ancient kingdom. The player controls an insect-like, silent, and nameless knight while exploring the underground world. The knight wields a nail, which is a cone-shaped sword, used both in combat and environmental interaction.