- Westone Bit Entertainment, Ryuichi Nishizawa, United Games Entertainment GmbH
- 28:81 year(s):day(s)
- Japan (Tokyo)
The longest time between a videogame project start and final release is 28 years 81 days, and was achieved by the release of Clockwork Aquario (Japan), originally developed by Ryuichi Nishizawa (Japan) and now-defunct Westone Bit Entertainment (Japan), and later resumed by United Games Entertainment (Germany), on 30 November 2021.
The project in Westone was started in 1991, and the concept was drawn in September 1991. Finally, the game was released on 30th November 2021.