Metal Slug is a co-op game. OpenEmu supports up to 4 players (though M Slug is 2 player).
He chose Marco (the original Marco, not the 3D remake one) and hit "Start." Instantly, the pixelated jungle of Mission 1 swallowed him whole. The first rebel soldier popped up from a trench, and a reflexive rat-tat-tat from his Heavy Machine Gun turned the man into a flailing, cartoon spiral. openemu metal slug
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Then he slipped. A stray bullet clipped his pixelated shoulder. Marco’s character spun, hit the dirt, and his knife spun away. One pixel of health left. The first rebel soldier popped up from a
Overall: Excellent choice for playing Metal Slug on macOS casually and with a polished library/front end; ensure you have the proper ROMs/BIOS and pick the most compatible core if you notice audio/timing quirks.