This is the easiest method. You will need the parent ROM set. Because this is not an official MAME ROM (like mslug.zip ), it is often found in "Homebrew" or "Hacks" sections of ROM sites. It will often be labeled as mslug7neo.zip or similar.
: Due to the DS's memory limitations compared to Neo Geo hardware, developers had to reduce the number of sprites, leading to some compressed graphics and a more "drab" color palette compared to the vibrant past entries. Metal Slug 7 vs. Metal Slug XX metal slug 7 rom neo geo
The legalities of emulation are often misunderstood. Emulators themselves are completely legal. However, downloading a copyrighted ROM from the internet, even if you own a physical copy of the game, exists in a legal gray area and is generally considered copyright infringement in most jurisdictions. For a 100% legal and ethical experience, you should either rip your own ROM from a game cartridge you own or purchase a legitimate re-release like Metal Slug XX on Steam. This is the easiest method
These are used with emulators like MAME, FinalBurn Neo, or on original hardware with a NeoSD. These are exclusively for Metal Slug 1, 2, 3, 4, 5, X . 5. Summary Table: MS7 vs. Neo Geo Metal Slug 7 Traditional Neo Geo Metal Slug System Nintendo DS Neo Geo MVS/AES Release Type Handheld/Console Exclusive Arcade/Console Co-op Single Player Only 2-Player Co-op Graphics Compressed, 2D Vibrant 2D Sprites Visual Style Often "drab" or "olive" tones Colorful and detailed Conclusion It will often be labeled as mslug7neo
The game introduced several new "Slugs" (vehicles) and a special map system on the Nintendo DS bottom screen.
If you obtain the correct .nds file, here is what distinguishes it from the Neo Geo predecessors: