Metal Slug 1 (Metaru Suraggu) is a run and gun video game developed by Nazca Corporation and published by SNK.
The game today features both versions and is now available for download for free on the Internet. The second version has you defending the castle you are protecting from a group of rampaging robots. A special adaptation of the famous SNK's classic Run'n'Gun for the amazing SEGA Megadrive/Genesis !! The original game is an arcade style slug fest game where you shoot pellets at incoming slugs to earn points.