Rating: 
Summary: The Ringworld is Unstable!
Review: This the second on a series of three books. I do recommend you read Ringworld first. The main Character, Louis Wu, has been located and dissuaded by the ancient race of Piersons Puppeteers into returning to the Ringworld. But when they do, they discover someone has been altering the ancient order of things. Ringworld was basically a cliffhanger. Ringworld Engineers is an excellent continuation of this story!
Rating: 
Summary: Read 'em all!
Review: What most people seem to have forgotten is that the Ringworld books (Ringworld, R.E., R.Thr.) aren't the only books in the series. ALL of the Known Space books must be taken as a whole. For instance, it's impossible to fully comprhend Ringworld E. without having read "Protector." All the known space books link together, PLUA the short stories. I suggest reading them all in chronological order and putting the pieces together yourselves. Sure, it will require more trips to the library, but, hey, whoever said life was easy?
Rating:
Summary: Excellent sequel
Review: When I frist read Ringworld, it amaze me, this book has continued to amaze me in the same way, and shows some of the things I wanted to see in the other book.Is so consistant that both books can be put together and the only thing that tells you when one starts and the other begins is the 23-year lapse between the events. Just one word of advice: read ringworld first, otherwise this book is almost tasteless. Reading protector will also be good.
Rating:
Summary: Filling in the gaps of Ringworld
Review: While the characters and the plot are rather flat, Niven is able to fill in many of the scientific gaps that were left in the orginal book. He answers many of the particular problems that would arise in the construction of the Ringworld and discusses many of the social issues that would arise upon the Ringworld. Despite the weaknesses of the book it is an enjoyable trip back to the novel creation of Larry Niven
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