I've been wasting my evenings with Riven most recently, trying to locate and rescue Catherine from her imprisonment. I won't review the game here, since there are several good reviews on the web such as the one at Macledge . Nor will I give anything away. I will comment that the graphics are absolutely stunning. Rock walls look just like real rock.
Sea creatures move visibly under the water's surface.
There are many beautiful animations particularly in one area that has flying insects. Realistic grass is evidently still problematic, though, since there is little of it to be seen. Some of the puzzles are pretty hard. You spend hours upon hours getting nowhere, then you finally uncover uncover some new, breathtaking part of one of the islands that you have'nt seen before. There is a webboard with tips and clues which can be visited judiciously if you really get stuck.