Many games have been lost ever since video games first existed. Most of the time it happens because the hardware isn't supported anymore (like UMDs, or if you're going further back, floppy discs), but other times it comes from a game being delisted.
Sadly, if there was never a physical release alongside, then chances are it will be near impossible to play that game - save for something like a dedicated fandom hosting private servers.
For this list, I will only be focusing on games that were released on the PS4. That does not mean they are all Playstation exclusives, as most of the games detailed here are on other platforms.
Sometimes still available on Xbox or PC - and forever with the possibility of a physical copy out there somewhere - these titles are no longer easily available on Sony hardware.
Luckily, most of the games on this list have copies in the wild, so all is not completely lost, providing you can devote the time to sorting through enough marketplace listings.
10. The Legend Of Korra
The Legend of Korra was a sequel to the well-loved Avatar: The Last Airbender show. And just like the series beforehand, Legend of Korra had a tie-in game.
Sadly though, this game is a horrendous mess, only causing frustration and pain.
It takes place between seasons two and three of the show, but has parts of season one shoved in. Becaue of this the whole plot is a mess. This game beats the live-action movie as the worst Avatar-related media ever made.
Korra was delisted from the PS4 store on December 21, 2017. It was developed by Platinum Games, who also made The Wonderful 101 and Bayonetta.
Fans of the show have been clamouring for a game that actually makes them feel like the Avatar, yet all we got was a disappointment. Something the show actually has in common with the game.
There were no physical copies made of the game so it can't be played anymore. That is the only good thing I can say about this game.