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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.
Tribes 2. Don't get me wrong. It's a great game, amazing even. But Tribes was a more focused experience.
I remember when Tribes had the full title Starsiege Tribes and was vaguely related to the now forgotten "MetalTech" franchise that started with EarthSiege and BattleDrome.
I owned all of the above.
Man, starsiege was such a fun game. I think there's actually still a community of players, but it was something special in its heyday.