Id like to make a suggestion to the creators of the game: Can you include optional (secret) sidequests? I always like sidequests in the final-fantasy games.
You can make the puzzles really hard for the diehard myst-fans. The story line - puzzles can stay easy to fit the mainstream.
To the players i propose the following challenge: No-Notition game:
You are not allowed to make *any* notes. this will make the puzzles more challenging ;-)