One of my favorite games growing up was Return to Ringworld. I could never get past "getting the datacron disk" or w/e it was and since this was the 90s, that meant you were stuck like that forever. My best friend and I would play it over and over again even though it was only 15 mins of play.
The real allure to the game was the ship's computer. We loved feeding the character until the screen yelled at us, "Stop already! The food is not that good!" It also had this sweet card game called Outpost Alpha. We'd play that for hours and hours.
Any adventure game, I loved. Anything from Sierra Online. The King's Quest series.. the one where it was just a bunch of puns. Where you had to throw a head of iceberg lettuce in a boiling river to make it cool down- those kinds of puzzles.(Errr.... was that CD-ROM or 3.5" floppy...?)
I also went through... 5 or 6 disks of Morrowind then told myself that fate just wouldn't let me play The Elder Scrolls.
Another favorite was Arx Fatalis. It had some neat hunger and cooking mechanics. I still play that game thanks to steam.
Speaking of thanks to steam, I bought:
Hexen, Hexen 2, quake, Wolfenstein 3D, Xwing, Tie Fighter....
Funny thing is, my SPORE disk won't work. The CD key is invalid because the company changed hands so many times. Customer Service basically told me to buy a new copy.