I would like to say that Riven is definitely richer, more coherent, more challenging, more clearly about something, and just plain better than Myst.
However, I think Myst was really about something, too, specifically about finding out what had happened in those places you found yourself in.
In Riven, you have the sense of a real place that could actually exist, and something is clearly going on there. Myst is more fragmented.
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