Classic (original) Duke Nukem and Doom were what introduced me to PC games. Shortly after Doom came out I was gifted the floppy disks and damn I swear it was only half an hour in and I was hooked on first person shooters after that. Started collecting games like it once I finished a couple of runs on different difficulties. Wolfenstein 3D, Heretic, Blood, Hexen, Duke Nukem 3D, Tek War....etc
As much as I love all the new graphics intensive and open world games that have come out over the years, I think the older, sprite based games will always hold a larger spot in my gamer heart.