Small hint that will save you some headache: don't forget to close the door once you're inside.

Riven has been a marvelous gaming experience. Althought there are some differences, i think it just parallels Myst's overall quality. Can't really decide which one i like the most.

These kind of games showcase a unique way of relating map design with puzzle design. Myst had more variety in it's location design and the whole thing was filled with puzzles of all kind. On the other hand Riven feels like whole single space, and actually you're not really solving random puzzles (because that's how they feel in Myst at times) but, instead, you're kinda solving just one or two big puzzles which involve a lot of exploration and some careful observation. So i guess in that sense, Riven feels a lot more cohesive and homogenic than Myst. But i'm not saying that as a pun for Myst: They are just two different beasts, two different models.

When it comes to the story, i definitely prefer Myst minimalism, but Riven is also fantastic.

Don't ever think of playing Riven without playing Myst first.