Kien, the most-delayed video game in history, released after 22 years
theguardian.com
theguardian.com
Also Grimoire (20 years, 1997-2017).
> The game has been in development since 2009 and, as of April 2024, does not have a release date.
https://www.youtube.com/watch?v=2b0tSu0QDQ0
And there are quite a few interesting fan project examples too, like the Doom mod Mordeth (started prior to Duke Nukem Forever, and might not be cancelled) and Mushroom Kingdom Fusion (started in some form in the year 2000, and still in development to this day):
https://mkfusion.fandom.com/wiki/Mushroom_Kingdom_Fusion#His...
There's also the possibility that Beyond Good and Evil 2 might break these records, given the game was announced/started in 2008 and still in some form of development as of 2024:
https://en.wikipedia.org/wiki/Beyond_Good_and_Evil_2
But yeah, neat to see this game finally being released.