Metal Slug Ps3 Pkg

This almost always means you forgot to enable HEN before launching the game, or the game requires a RAP license that you haven't installed yet. Black Screen on PS2 Anthology PKG:

Metal Slug runs at 60fps. If it’s slow, go to multiMAN → Settings → Emulator and force the PS3’s CPU to run at full clock speed (disable power-saving modes). Also, ensure you’re not using a PAL PS3 video output set to 50Hz. metal slug ps3 pkg

& 2 : These have appeared as PSOne Classics in certain regions (like Japan) and can be downloaded if you have access to those regional accounts. This almost always means you forgot to enable