What is "r.u.r.u.r."

is a Japanese H-game for computer, developed and published by light. The game is known for its use of established science fiction elements in its story, along with numerous references to several works of literature, including Antoine de Saint-Exupéry's The Little Prince and Karel Čapek's R.U.R.

In mid-2008, light announced that a PlayStation 2 port titled R.U.R.U.R. -petit prince- was in development. As of November 2009, the port will be released for PlayStation Portable, and was released on September 22, 2010.