Metal Slug 6 , released in 2006, was different. SNK Playmore had moved on. Metal Slug 6 ran on the hardware.
Because 0.139u1 is an older version, you may encounter problems: metal slug 6 mame 0139u1 rom exclusive
When you see "Metal Slug 6 MAME 0139u1 ROM exclusive," it is usually a request for a "Frankenstein" file—a version of the game hacked to run on an older, more convenient emulator core. Metal Slug 6 , released in 2006, was different