Marvel's Wolverine is still years from release, but people are currently playing - and uploading footage - of an incomplete early development build found within the files stolen from Insomniac Games by ransomware hackers earlier this month.
It's remarkable to see an in-development game being played in this way - and I can't think of a similar situation, at least in recent memory. The GTA 6 hack contained a mountain of development assets, yes, but nothing playable in this manner.
Here, people have been able to access a test build of Wolverine akin to an internal demo meant for Insomniac and Sony, that features multiple sections of the game available to play and explore. Naturally, these sections are still incomplete and unpolished, but key gameplay mechanics and story moments are included.