Excerpt from [wikipedia]:
“Dreamcast Collection is a video game compilation for Xbox 360 and PC. It includes four games from the Dreamcast, Sega‘s video game consoleoriginally released in 1999. These games include Sonic Adventure, Crazy Taxi, Space Channel 5: Part 2 and Sega Bass Fishing.
All games released in the bundle are available for purchase separately on the Xbox Live Arcade, PlayStation Network and Steam. It was originally listed for release on the PlayStation 3 but has not been released on PlayStation 3 as of December 2011 for unknown reasons.”