Steins;???

Steins;??? is in development by Chiyomaru Studio and Mages, and is written by Mages' representative director Chiyomaru Shikura. It was initially known internally under the working title Steins;God until Shikura decided against it. Shikura wanted to create something new with Steins;???, as he considered Steins;Gate to be complete after the original game and Steins;Gate 0, and thought that further Steins;Gate games would be redundant. The idea of creating a Steins;Gate take on Chaos;Child came from how, although Chaos;Child's plot had been well received, it had only sold about a tenth as many copies as Steins;Gate.

Shikura brought up the concept of a Steins;God game in a Famitsu interview in September 2018, and Science Adventure series producer Tatsuya Matsubara teased that a new game in the series was in development by February 2019. The game was eventually announced by Mages during their business strategy presentation in October 2020, as part of a celebration of the original Steins;Gate's tenth anniversary, with the second half of the title obscured; at the time, Shikura had finished planning a large amount of the game's story sequences.