This is a followup to @SorosFootSoldier@hexbear.net ‘s recent thread for completeness’ sake.
I’ll state an old classic that is seen as a genre defining game because it is: Myst. Yes, it redefined the genre… in ways I fucking hated and that the adventure game genre took decades to fully recover from. It was a pompous mess in its presentation and was the worst kind of “doing action does vague thing or nothing at all, where is your hint book” puzzle gameplay wrapped in graphical hype which ages pretty poorly as far as appeal qualities go.
So many adventure games tried to be Myst afterward that the sheer budgetary costs and redundancy of the also-rans crashed the adventure game genre for years.
I think World of Warcraft back in 2006 or something. I discovered two things: a) if I’m going to grind, I really have to enjoy the core game play. I did not b) to get the most out of WoW you had to have some friends playing with you, which my friends who had been playing for a while did not want to, or didn’t want to explain things to me