This is a classic 1996 run-and-gun arcade shooter where you join the Peregrine Falcon Strike Force to stop General Morden's coup in 2028. The core gameplay involves intense, side-scrolling action requiring precise shooting and movement, including a tactical prone roll to dodge fire. A distinctive feature is the ability to commandeer heavy vehicles, like the titular Metal Slug tank, to aid in clearing heavily fortified enemy lines across linear stages. It remains a foundational title in the genre, available across many platforms.
The game centers around intense, side-scrolling action where precise movement and rapid firing are essential for survival. Players navigate challenging, linear stages, engaging waves of enemy infantry, armored vehicles, and aerial threats. The primary objective is to push forward through enemy lines, utilizing a variety of standard and acquired weaponry.
The gameplay loop revolves around constant movement and combat engagement. A defining feature is the ability to perform a quick hop or a more vulnerable, but strategically useful, prone roll. This maneuver allows players to dodge low-flying projectiles and reposition quickly in the heat of battle.
Furthermore, players can commandeer various vehicles scattered throughout the levels. The most iconic of these is the titular armored vehicle, which offers significant firepower and protection, fundamentally altering the pace and strategy of certain encounters.
The narrative begins in a world grappling with escalating military tensions between the established Regular Army and the organized militant factions forming the Rebellion. The conflict is fueled by tragedy, as General Morden defects after a catastrophic intelligence failure leads to personal loss, setting him on a path to establish a "New World Order." Players step into this volatile environment as Marco Rossi or Tarma Roving, fighting to restore order.
What sets this title apart is its commitment to detailed, fluid sprite animation combined with its signature blend of frantic shooting and tactical vehicle use. The visual presentation, characterized by detailed pixel art and large enemy sprites, provides a distinct aesthetic within the run-and-gun category. The gameplay demands mastery of both on-foot combat and vehicle operation to overcome the escalating difficulty.
Since its debut in 1996, this main game has seen wide distribution across numerous platforms, including Arcade, Neo Geo AES, Neo Geo CD, PC (Microsoft Windows), Linux, Mac, PlayStation 3, PlayStation Portable, Wii, iOS, and Android.
As the initial installment in the series, this specific title currently features no officially released downloadable content (DLC) or expansions.

A Game Boy Advance port was announced to be in development but was never released to the public.

Metal Slug is the original entry in one of the most famous action game series ever released. It was originally released by SNK in 1996. Players control Marco and Tarma who belong to the Special Forces team known as the 'Peregrine Falcon Squad'. They fight to defeat General Donald Morden, in an effort to take back their stolen weapon known as the 'Metal Slug'. Players can utilize various weapons and vehicles such as the Metal Slug to sway the fight in their favor.

Metal Slug: Super Vehicle-001 is a run and gun action shooting game. Between April and August 1997, Sega Saturn and PlayStation versions developed by SNK and Ukiyotei respectively were released only in Japan. Both ports feature "Combat School" mode from the Neo Geo CD release while the PlayStation version features a new mode, "Another Story", consisting of plot-based minigames, and an art gallery featuring concept art (characters, vehicles, weapons, levels). To retain all animations frames of the arcade original, the Saturn version used newer compression techniques, inter-level loading and the 1 MB RAM expansion cartridge.