This is normal for 0.139u1 because it does not support Atomiswave hardware-assisted rendering. Error "Missing Files": You need to verify that mslug6.zip
Today, this version is still widely used in Android emulation (like MAME4droid) because it is lightweight and stable. 🔫 Deep Dive: How MS6 Changed the Formula Metal Slug 6 metal slug 6 mame 0139u1 rom exclusive
Includes the expanded roster (Marco, Tarma, Eri, Fiolina, Ralf, and Clark), each with unique stats. Classic Gameplay: This is normal for 0