Ringworld was created in 1970-10.
The Ringworld Throne was created in 1996.
The Ringworld Engineers was created in 1980.
The Ringworld Engineers has 357 pages.
The ISBN of Ringworld is 0-345-02046-4.
The Ringworld Throne has 424 pages.
The ISBN of The Ringworld Throne is 0-345-35861-9.
The ISBN of The Ringworld Engineers is 0-03-021376-2.
Ringworld - role-playing game - happened in 1984.
The cast of Return to Ringworld - 1994 includes: Fred Bologna Gordon Moore Paddy Myers Cindy Schoonmaker
Sadly no. Halos, the ringworlds of the game Halo, are based on the Known Universe stories by science fiction author Larry Niven: Ringworld (1970), The Ringworld Engineers (1979), The Ringworld Throne (1996), Ringworld's Children (2004), and Fleet of Worlds(2007). Niven developed the idea of an artificial world built in the optimal diameter of the Goldilocks Zone of a star system when he examined the idea of a Dyson Sphere and realized just how impossibly huge such a construction would be to use in a story. Halos and Ringworlds are totally fictitious.Just for perspective:Realistically, to build a Halo/Ringworld in Sol System would require more resources than are available in the entire system, including everything in the Kuiper belt and the Oort cloud.
A person can find the book "Ringworld" by Larry Niven at several different places. Some of these places include Amazon, eBay, Books-A-Million, and Overstock.