NEO-GEO Action Shooter 2000

Metal Slug 3

Reviewed by Marcus Webb & Elena Castillo · Updated June 2025

SNK's crowning achievement in the Metal Slug series — Metal Slug 3 features the franchise's most elaborate level designs with branching stage paths, multiple vehicles including submarines and zombie forms, the longest and most ambitious final stage in run-and-gun history, and the series' signature pixel art at its absolute peak. Widely considered the greatest Metal Slug game ever made.

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💡 Metal Slug 3 — Key Facts

→ Metal Slug 3 was developed by SNK and published by SNK
→ Released in 2000 on NEO-GEO
→ Genre: Action, Shooter
→ We rate it 9.7/10 — an absolute classic
→ Part of the Metal Slug franchise
→ SNK's crowning achievement in the Metal Slug series — Metal Slug 3 features the franchise's most elaborate level designs with branching stage paths, multiple vehicles including submarines and zombie forms, the longest and most ambitious final stage in run-and-gun history, and the series' signature pixel art at its absolute peak. Widely considered the greatest Metal Slug game ever made.

Overview

The final stage of Metal Slug 3 doesn’t end where it looks like it should end.

When players complete what appears to be the climactic sequence, the game continues. The alien spacecraft interior gives way to something larger. Then larger still. The stage is the longest in run-and-gun history not because the design ran out of ideas, but because it kept finding new things to do.

The Branches

Each mission contains multiple paths. Different routes lead through different encounters — the underwater submarine sections versus the surface assault route, the zombie-infested lab versus the mountain path. The paths reconverge before the mission boss.

The branching design created replay value the first two Metal Slug games didn’t have. Completing the game once reveals approximately half the content — full exploration requires choosing different paths on subsequent playthroughs.

The Zombie

Zombie enemies exist in Mission 3’s laboratory stages. Their attacks transform the player character.

A zombified player loses their weapons. Gained: a ranged projectile-vomit attack. Lost: movement speed, weapon variety. Changed: vulnerability profile.

The transformation is a tactical consideration. The vomit attack is powerful against crowds in ways that standard weapons aren’t. Players who understand the transformation sometimes let it happen deliberately in enemy-dense sections before seeking the cure.

The Pixel Art

Metal Slug 3’s sprite work represents hand-drawn pixel animation at a level that specialized hardware took over a decade to achieve. Every enemy has elaborate death animations — the effects of each weapon type visible in different ways. Vehicles explode in multiframe sequences. Transformation animations play out in full.

The Neo-Geo hardware spent years reaching this peak. Metal Slug 3 arrived as one of the last major releases on the platform, having accumulated that hardware’s full potential.

Our Review

9.7

Masterpiece / 10

🎮

Gameplay

★★★★★

🎨

Graphics

★★★★★

🎵

Audio

★★★★★

🔄

Replay

★★★★★

Gameplay

Metal Slug 3 is a side-scrolling run-and-gun with four playable characters (Marco, Tarma, Eri, Fio) through five missions with branching paths — different routes through each stage lead to different encounters and rewards before converging at the mission's end. Primary weapons include the standard pistol with infinite ammo, Heavy Machine Gun, Rocket Launcher, Flame Shot, Laser Gun, Enemy Chaser (homing), and others collected from enemies. Vehicles include tanks, submarines, camels, and ostrich mounts. The zombie transformation — hit by zombie attacks, the player turns into a zombie with a powerful vomit attack but different vulnerabilities. Two-player simultaneous co-op.

Graphics

Metal Slug 3's pixel art is among the finest ever created — the hand-animated sprites, enemy death animations, vehicle destruction sequences, and transformation effects represent the Neo-Geo hardware at its technical peak and one of pixel art's high-water marks regardless of platform.

Audio

Metal Slug 3's soundtrack — driving electronic/rock compositions for each mission — provides energetic combat accompaniment. The final stage's music escalates appropriately for the game's most ambitious content.

Replayability

Branching stage paths create different encounters on different playthroughs. All weapons and vehicles to discover, two-player co-op, and higher difficulty settings provide substantial replay. The game's density — every screen has content — rewards detailed exploration.

Historical Significance

Metal Slug 3 (2000, Neo-Geo) is widely considered the series' masterpiece — the fourth entry that refined everything the franchise had built across Metal Slug, Metal Slug 2, and X. The branching stage design, the zombie transformation mechanic, and the enormity of the final stage set a standard within the run-and-gun genre. The Neo-Geo hardware's final years produced Metal Slug 3 as one of the most technically accomplished 2D games ever released. The game has been ported to numerous modern platforms and remains the definitive Metal Slug experience.

✅ Pros

+ Branching stage paths create genuine replay variety
+ Zombie transformation adds tactical layer to enemy design
+ Final stage is the most ambitious in run-and-gun history
+ Pixel art represents the technical peak of 2D sprite work
+ Two-player co-op enhances the already excellent solo experience

❌ Cons

- Final stage length can feel excessive on first encounter
- Some vehicle sections mandatory for full stage experience
- Neo-Geo original hardware increasingly rare and expensive

Also Known As

Metal Slug 3 Neo-Geoメタルスラッグ3

Metal Slug 3 FAQ

What makes Metal Slug 3 different from the other Metal Slug games?

Metal Slug 3 introduced branching stage paths — each mission contains multiple routes that lead through different encounters before converging at the mission end. This created replay value that the earlier games' single linear paths didn't provide. Metal Slug 3 also added the zombie transformation: being hit by zombie enemies converts the player character into a zombie with a powerful projectile-vomit attack, different movement, and unique vulnerabilities. The game also includes more vehicle types than previous entries (submarine being the most notable new addition), more unusual transformations (walking on stilts, space suits), and the franchise's longest and most complex final stage. These additions collectively made Metal Slug 3 the most content-rich entry.

What is the zombie transformation in Metal Slug 3?

In Metal Slug 3, certain zombie enemies can infect player characters with a zombie transformation. A transformed zombie player loses their standard weapons and gains a projectile vomit attack — a ranged splash attack that deals high damage to multiple enemies. The zombie form also changes movement (slower, lurching) and vulnerability profile. The transformation is reversible: Tarma can cure the zombie state by rescuing specific POWs who happen to be doctors, or the player can let the transformation run its course. The zombie form is both a hazard (losing weapon capability) and a tactical option (the vomit attack is powerful against crowds). Experienced players sometimes intentionally allow transformation for specific sections.

What is the final stage of Metal Slug 3 like?

Metal Slug 3's final stage — Mission 5 — is the longest and most elaborate level in run-and-gun history. The stage begins on Earth and progresses through a massive alien invasion sequence, requires traversal of an alien spacecraft, features multiple environment changes and setpiece encounters, and ends with a sequence of boss encounters larger and more elaborate than any in previous Metal Slug games. The stage includes multiple vehicle sections, the game's largest enemy formations, and a final boss confrontation that escalates in phases. Players encountering the stage for the first time without knowing its length are often surprised to find it continues well past what seems like a logical endpoint — the stage keeps going and keeps escalating.

Is Metal Slug 3 available on modern platforms?

Metal Slug 3 is widely available on modern platforms. It appears on PlayStation 4, Xbox One, and Nintendo Switch through the SNK 40th Anniversary Collection and individually through digital storefronts. Metal Slug 3 is available on Steam for PC. ACA Neo-Geo Metal Slug 3 releases are available on PS4/PS5 and Nintendo Switch through Hamster's Arcade Archives series, which provides accurate emulation of the original Neo-Geo code. The SNK 40th Anniversary Collection includes Metal Slug 3 alongside numerous other SNK classics. The game is one of the most consistently available classic arcade titles across digital platforms.