What I'd love to see is a leak of the original "Prey". Not the id Tech 4-powered shooter by Human Head Studios, but the 3D Realms one.

So many stories about this one. At least 3 generations of creatives, a KMFDM soundtrack, a perhaps over-ambitious heavily portals-based engine, destructible environments, later engine work by Corinne Yu, etc.

Edit: Oh wow! I just googled for a YouTube video of the 199x E3 demos to link here, and the 1995 version apparently did leak days ago: https://archive.org/details/prey-1195/

Next, a leak of the 1997 rework please: https://www.youtube.com/watch?v=xbBDzzOzS4E

The level of detail and the dynamic portals were just so cool at the time. The demos from about 4:00 onward and especially at 5:00 onward more or less predict the later gameplay of Valve's Portal games.

Edit 2: Since this is HN, after all, here's a fascinating Usenet discussion with on the of the Prey engine developers, W. Scarboro, on his experiences with the portals approach: https://groups.google.com/g/comp.graphics.algorithms/c/2Oa-M...

Unfortunately since passed away, at only 31, due to asthma.