Malek86: POP3D is just weird. My disc copy simply won't work, no matter what I try. Compatibility options, dgVoodoo, nothing.
Then I found a copy from an abandonware site, and that one works fine. Not perfectly mind, there are occasional ground textures issues and the game can slow to a crawl in large areas (640x480 is recommended), but it is playable. Well, as playable as POP3D can be, though I kinda like it myself for some reason. If only I knew what they have done to the executable to make it work, I could do that to my English disc copy and play it instead. Because the Italian dub is atrociously, hilariously bad.
Gotta agree on POP2 as well, the first game was challenging but fair, the second game... not so much. Still finished, but I'm never gonna play it again.
The original copy of POP 3D is notoriously impossible to run on Windows 10. The OS doesn't support the game's copy protection, so you need either an "unprotected", original exe or a cracked one to start the game to begin with.
The texture bug is well known as well, you need to have the game's second CD-ROM in the drive (or a digital copy of that mounted in a virtual drive) to show the right textures in the later levels of POP 3D.
So there's an Italian version of POP 3D? That's interesting, I should try and recover a copy for my collection one of these days...
As I said, POP 2: The Shadow and the Flame is a VERY old school kind of "fun" game :-D
When I had it on my 286, I was playing the game all the time and I had essentially mastered it. Tried nowadays, it took me a lot of pain, time and patience to put an end to the ordeal. I don't plan of doing it again for at least some years :-D