The search result for a "feature" related to the typically refers to its status as a non-working (preliminary) or unplayable ROM in that specific older version of MAME . Key Facts for MAME 0.139u1 (MAME4droid/RetroArch)
What are you using? (Android, PC, or a handheld like an Anbernic?) metal slug 6 mame 0.139u1 rom
: MAME often includes features like save states, cheats, and filters to enhance your gaming experience. Explore these to get the most out of your playthrough. Metal Slug 6 MAME 0
Since the Atomiswave is very similar to the Sega Dreamcast , you can find community ports that run perfectly on Dreamcast emulators. metal slug 6 mame 0.139u1 rom