OD‍ is an upcoming horror game developed by Kojima Productions and published by Xbox Game Studios. It was conceived during the development of Death Stranding (2019), with its concept described as testing the players' "fear threshold, and what it means to OD on fear". The game was rejected by numerous companies until the studio partnered with Xbox in June 2022. Hideo Kojima collaborated with filmmaker Jordan Peele on the project. The cast features Sophia Lillis, Hunter Schafer, and Udo Kier in a posthumous appearance.

Hideo Kojima conceived OD while working on Death Stranding (2019). He pitched the project to numerous publishers, all of whom rejected it because they found the concept too unconventional and difficult to understand and execute. The only publisher that was interested was Xbox Game Studios. Kojima Productions and Xbox Game Studios announced their partnership for OD at the Xbox Games Showcase in June 2022. Kojima stated that the studio was working with Xbox and its cloud gaming technology "to take on the challenge of creating a very unique, immersive, and totally new style of game—or rather, a new form of media". In November, approximately two and a half minutes of alleged gameplay footage leaked online. It depicted a character from a third-person perspective, visually resembling Margaret Qualley, walking through dark corridors with a flashlight. The scene ended with a "Game over" message, followed by the phrase "A Hideo Kojima game", and the title Overdose.

OD was officially revealed by Kojima and Jordan Peele with a teaser trailer featuring Sophia Lillis, Hunter Schafer, and Udo Kier at the Game Awards 2023. Kojima described the project as "avant-garde" and "something totally different", and that players would "either love it or hate it". He further remarked that he believed its true evaluation would come "10 or 20 years from now". Kojima aimed to make the game "as scary as possible" and "go beyond the limit of the 'scariness'" compared to other horror games. Simultaneously, the game will include a system designed to help players continue if they find the experience too frightening. Filming and scanning were suspended beginning in the second half of 2024 due to the 2024–2025 SAG-AFTRA video game strike. The game is being developed using Unreal Engine 5.

In September 2025, a second teaser trailer, subtitled "Knock", was released during Kojima Productions's 10th anniversary event. The teaser showed Lillis's character performing a candle lighting ritual, until she gets immobilized in fear and ambushed by an unseen entity knocking and opening the door. Kojima stated the game would explore various fears, citing the sound of knocking as a personal example, while Peele would be addressing a "different kind of fear". Kojima suggested that OD will be an anthology horror game, with segments written by various directors he referred to as "the Avengers", including himself and Peele. He said that unlike his earlier games, Metal Gear and Death Stranding, which he described as "system-wise similar to other games", with OD the studio is attempting to "change the service model from the ground up".

In November 2025, Kojima stated that Kier did not complete recording his voice and motion capture footage for the game before his death. The game resumed development by June 2026.

Following the release of the teaser "Knock", several commentators noted its resemblance to P.T. (2014)—an interactive teaser for the video game Silent Hills, a cancelled installment in the Silent Hill series, directed and designed by Hideo Kojima in collaboration with filmmaker Guillermo del Toro. Jez Corden of Windows Central deemed that "Knock" looked "ripped straight out" of the earlier work, while Oli Welsh of Polygon wrote that it "strongly recall[ed]" P.T. to him. Matt Purslow of IGN noted "clear parallels" between the two games, asserting that OD is "reusing and reinterpreting many of the themes, motifs, and designs that were established in [P.T.]. From ominous knocking to terrifying babies [...]".