Watchmen: The End Is Nigh is an episodic video game series that serves as a prequel to the film adaptation of the comic book Watchmen. The game was originally announced for release in downloadable installments on Xbox 360, PC and PlayStation 3, with the first one released in March 4, 2009 to coincide with the film's theatrical release. The second episode was released on July 30, 2009.
Both episodes were released together on disc on July 21, 2009 for Xbox 360 and PlayStation 3. The PlayStation 3 version is billed as "The Complete Experience" and includes an extended version of the movie in Blu-ray format.
Source: Wikipedia, "Watchmen: The End Is Nigh," available under the CC-BY-SA License.