There are seemingly endless places in different worlds to explore and puzzles to solve. Nice graphics, if a bit dark. You can always just go in to your favorite world and walk around if you don't feel like solving puzzles at the moment. Lots of fun!
This new version of Riven has the same five islands as the old version (so far) but there is much more detail and color, and the puzzles are different. Your old Riven notes will not help much. It's odd to feel like you've been somewhere before and yet need to explore it all, at the same time, but that is how this feels. There's a lot to see and do and figure out. I can't wait to get further in. I am enjoying it so much. Like other Cyan games, it really takes you out of your own world, into another.