From Wikipedia "Myst is a graphic adventure puzzle video game". No offence, but if Myst isn't an adventure game, then I don't know what is.
I take the liberty of intervening here to clarify that Myst was indeed one of the first graphic adventure games with mouse gameplay, and especially the best-selling, on all possible media, becoming one of the greatest references of the genre to such point that a classification bringing together the characteristics of games in the first person, via exploration, reading and solving puzzles is officially called "mystlike".
Indeed, the genre of adventure games is divided into several categories, such as "point & click", investigation simulations, text games, and mystlike. If Myst is in no way representative of Point & clic "LucasArts or Sierra - style", it is nonetheless the largest representative of a category, and therefore remains one of the best representatives of adventure games in general. It is not a negligible game in the history of Video Games, but on the contrary an indisputable iconic cultural benchmark.
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Thanks for the good clarification on that. Yes, I was mostly joking about Myst not being an adventure game. I didn't think about the fact that people less familiar with the genre might take me seriously.
But yes, Myst is definitely an adventure game and a very popular one. All I really meant to say was that Myst did not start adventure games or even make them popular. They started way before Myst and were already very popular. But I did not mean to imply that Myst was not a popular game. It certainly was. And again, yes it is an adventure game.