Rebels: Prison Escape, an abandonware video game from 2004 by a Hungarian studio that went bust.
To me it was always a mystery why it wouldn't work. There is no information about the game, no walkthroughs, no fixes, patches or even videos on YouTube except a few cinematics and old amateur footage.
The challenge, if anyone has time and curiousity - figure out if it's possible to go beyond the first level prison. To me both this version and the retail copy I had about 10-14 years ago would crash after finishing the first prison. It produces a crash log but I have no clue whatsoever. It's one of those games that Ross Scott might want to do a video of Game Dungeon considering how cryptic the internet is about this game, but until then...
This is the only game I saw that took the prison thematic seriously and made it work.
It's basically an Isometric RTS/Steath like Commandos or Robin Hood.