Cyan, Inc., also known as Cyan Worlds, is an American video game developer, founded by brothers Rand and Robyn Miller in 1987, and best known as the creators of the Myst series. After Myst and its sequel Riven sold several million copies each, Cyan went on to create the massively multiplayer online adventure, Uru, which was cancelled and re-opened several times. After the departure of brother Robyn Miller from "Cyan, Inc.," a second company, "Cyan Worlds, Inc.," was started.