The second major addition is the . You can now carry two weapons at once (e.g., a Flame Shot and a Rocket Launcher) and swap them on the fly with the "D" button. This fundamentally changes strategy—no more dropping a powerful shotgun to pick up a pistol by mistake.
As for the MAME ROM, MAME (Multiple Arcade Machine Emulator) is a free, open-source emulator that allows you to play classic arcade games on your computer. The Metal Slug 6 ROM is a file that contains the game's data, which can be loaded into MAME to play the game on your computer. metal slug 6 mame rom