I'm going to be in San Francisco soon and I actually really considered making a pilgrimage to the original Sierra Oakhurst building [0] which says something about how much of an impact their games had on me. I can't say that I stayed with QFG all the way through III and IV but QFG I (aka Hero's Quest) is one of my all time favorites.

[0] https://forum.guysfromandromeda.com/topic/171-sierra-oakhurs...