[SoccerDude28]

I don't think story is enough to define an adventure game.

Okay so in the broadest sense there is no adventure without a story, so that means that story is a universal element of every adventure in existance. But just coz every human being has legs, doesn't mean that animals or chairs are human being because they have legs. There is more to what define humans than their legs. They have 2 legs, they have a brain, they have 2 arms, they have 5 fingers on each arm, much less hair on their body. Now you are defining a human being more accurately. Every adventure game that I can think of has puzzles (in the traditional sense). So story and puzzles. Now we are getting somewhere. See what I mean? Story by itself cannot define an adventure game, because it encompasses a whole plethora of other genres.