If you're looking for the most recent entry in the series, Metal Slug: Awakening is a modern mobile-first title that can also be played on PC via official launchers.
Widely considered the peak of the series, featuring branching paths and underwater/space missions. Metal Slug PC Collection Free Download
The PPSSPP emulator can run the Metal Slug Anthology (PSP version), which many players find to be a highly accessible way to play the entire collection on modern hardware. If you're looking for the most recent entry
While "free download" sites often host older versions of these collections, many of these sources can be unreliable or pose security risks. For a safer and more authentic experience, modern players typically use the following methods: Metal Slug PC Collection Free Download