@nprofile1q... I think the hard part is just learning the 720 degrees of freedom style in the first place. Once you've got that, it really is "just like riding a bicycle" as they say.

I sort of have the opposite. When I go back and play these classics with more modern engines and modern equipment, I find them to be too easy compared to how hard they were for me way back then, lol. Especially Doom. I had to play them slow-paced back in the day, but now I'm moving around fast, aiming quickly and easily, and just finding them all around less challenging. It's... weird...