Today, I discovered the Myst app for the iPhone. MYST was my all-time favorite game when it came out on the Mac, so I HAD to buy the app for my iPhone this morning.
I haven't spent much time on it yet, so I'll report more later; but so far, I'm impressed! The graphics and sound effects are just like I remember! It navigates easy once you learn the tricks. The help section will tell you all you need to know to get around.