If you own the original game disc or board, you can play it on PC using an emulator.
: If you do download files, run them through VirusTotal before opening them.
This was the first game to introduce the Weapon Stock system (carrying two power-ups) and unique character abilities (e.g., Marco has stronger pistols, Eri can throw grenades in any direction).
: This collection includes Metal Slug 1, 2, X, 3, 4, 5, and 6 . It is available on various platforms and can be played on PC via official emulation or backward compatibility.