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Because MAME is built to replicate physical arcade hardware coin-ops, it lacks the architecture to boot Nintendo DS or PSP files [1]. To play Metal Slug 7 on modern emulation frontends, you must source the correct ROM type for the corresponding emulator core.

MAME (Multiple Arcade Machine Emulator) is designed to preserve arcade history. Because Metal Slug 7 is technically a console/handheld game, standard MAME is not the ideal tool to play it. The Alternative: RetroArch and DeSmuME / MelonDS Core

: SNK later released an upgraded arcade version titled Metal Slug XX on the Sega RingWide hardware, which is highly demanding and outside the scope of lightweight retro setups.

Metal Slug 7 on PC: Recalbox, MAME, and Modern Emulation (2021-2026 Guide)

To replicate the classic Neo-Geo cabinet layout on your PC or Recalbox setup, map your controller or arcade encoder using this traditional four-button layout: Shoot / Fire Weapon Button B (Bottom): Jump Button C (Right): Throw Grenade

: None (Not supported by MAME/FinalBurn Neo)

: On a Recalbox PC, the PPSSPP core is the preferred method for running the PSP version of XX . It offers redrawn graphics, native widescreen support (unlike the DS original), and allows for the critical "autofire" toggle not present in many older ports.

: There is no native MAME ROM for Metal Slug 7 . Because the game never had a traditional arcade release, standard arcade emulators like MAME or FinalBurn Neo cannot run it.