To (or Atomiswave roms), the most common methods include:

Purists often search for a "Neo Geo MVS/AES ROM" of Metal Slug 6 to load into traditional emulators like NeoRAGEx or standard Neo Geo bios folders.

Metal Slug 6 is often associated with the series' Neo Geo roots, it was actually the first main entry to move away from that hardware. Because of this, finding a "real" Neo Geo ROM for it is tricky; the original game runs on different architecture. Platform and Compatibility Original Hardware: Metal Slug 6 was developed for the Sammy Atomiswave arcade system, not the Neo Geo MVS/AES. Neo Geo "ROMs":

Every time Leo damaged it, the screen flashed: and its health refilled. Leo’s thermometer was at 98%.