Microprose - Masters of Magic and Masters of Orion and Masters of Orion 2.
Masters of Orion 3 was a major disappointment. Probably more realistic from a governing the galaxy point of view, but lost the majority of the elements that made Masters of Orion 1 & 2 enjoyable in the translation to "grown up domination of the universe".
There was one called I believe Kings Bounty that I really liked.
The Elder Scrolls - Arena - Loved the riddles. We actually called playing Arena "Serving the Master." Another favorite was "Going to get some Vitamin Videogame."
The Elder Scrolls - Daggerfall - RRRRRRRRRGagggggggggh........alllllllllllllll!!!!!!!!!!! Spent countless hours on this game only to have an item I needed to finish the game disappear from my backpack. I haven't picked up an Elder Scrolls title since.
Eye of the Beholder 1 & 2. I don't recall if I played 3. Pretty neat puzzles. I quit playing Darkmoon because I couldn't find a stupid hidden mirror? shield, but then I picked it up a year later and found the shield in ~5 minutes (guess I just need to think about it for a bit
) Wait, I must have played 3. Were the Feyrs and some sort of cool black headed returning throwing hammer in #3???
Anything Metroid.
If I could own two arcade games they would be
Super Mario Brothers
Mortal Combat