The stages in Metal Slug 7 are exceptionally large compared to older titles, offering a more extensive journey.

Before its financial restructuring, SNK moved its arcade developments from the aging Neo Geo to Sammy’s arcade board (and later Sega's NAOMI system). Metal Slug 6 was actually released on the Atomiswave.

Metal Slug XX is natively available on Steam with full controller support and achievements.

Metal Slug 7 Neo Geo ROM: The Myth, The Reality, and The History

Here’s a concise piece for you:

Available digitally via the PlayStation Store.

You will need a .nds ROM file extracted from your legal physical copy. Metal Slug XX (The Definitive Edition)