Whenever I get into a gaming comversation with anyone, I generally ask if they have played the Myst series, and of course they answer no. The Myst series, especially Riven, is not for those who cannot live without amazing graphics, and the point of the game is not in the graphics for me. It's the puzzle that makes this game amazing.
You find yourself getting a special notebook for the game, drawing out the various shapes you find in the world because it might be a clue later on.
Riven is my favorite in the series because it has some of the most difficult, yet most rewarding puzzles I could imagine. Solving the big puzzles requires a careful understanding of the world you have explored, and the ability to recognize an association between two items, perhaps a sound and an image.
This does require patience! You might get stuck for several days on a problem, but when you finally figure it out it all makes sense!
Despite having played several modern games like Team Fortress 2 and Warframe, I still view this game as the best game I have ever played.