Several computer and video game versions of Risk have been released as The Computer Edition of Risk: The World Conquest Game, starting with the Commodore 64 edition in 1988 and the Macintosh edition in 1989. Since then, various other editions have been released for PC, Amiga, Sega Genesis, PlayStation, PlayStation 2, and Game Boy Advance. In 1996 Hasbro Interactive released a PC version of Risk that included a new variation on the game called "Ultimate Risk", which did not use dice but rather implemented the use of forts, generals, and complex battle strategies. Risk II for PC and Mac was released as a 2000 video game which includes classic Risk as well as board and gameplay variations. In 2010, Pogo.com added a licensed version of Risk to its library of online games. An Xbox Live Arcade version of Risk called Risk: Factions was released on June 23, 2010. It includes classic Risk as well as a factions mode where players can play as Zombies, Robots, Cats, Soldiers, or Yetis.
An official licensed iOS app, "RISK : The Official Game", developed for the iPhone and iPod Touch by Electronic Arts, was released on July 16, 2010.
Source: Wikipedia, Risk (game), available under the CC-BY-SA License.