"Metal Slug is a series of run and gun video games first released on Neo-Geo arcade machines and game consoles created by SNK. It was also ported to other consoles, such as the Sega Saturn, the PlayStation, the Neo-Geo Pocket Color and more recently, the Game Boy Advance, PlayStation 2, Xbox, Xbox 360 and Nintendo DS. There is also an anthology of the first 7 games in the main series (including Metal Slug X) available for the Wii, PlayStation Portable, and PlayStation 2. In 2009 the three first games were officially ported by Games Load to Windows."
Source: Wikipedia, "Metal_Slug_(series)", available under the CC-BY-SA License.