METAL SLUG DEFENSE

Free-to-play 2D tower defense with unlockable units and multiplayer battles

SNK CORPORATION · Released May 1, 2015

Reviews: Mixed; 57% of 2,471
Recent reviews: Mostly Positive; 71% of 14 in 30 days
Players: 10; daily peak, Nov 7, 2026
Steam Deck: Untested
Last update on Steam: Unknown; no patch notes on Steam
Minimum PC: HD; 1 GB RAM · 0.3 GB disk; Full requirements

What is METAL SLUG DEFENSE?

This free-to-play 2D tower defense game takes place in the Metal Slug universe, where humans, aliens, and giant robots fight. You deploy and upgrade units through levels, or face other players in one-on-one and two-on-two matches.

For you if...

+you enjoy choosing units for strategic defense battles
+you want solo levels and multiplayer matches
+you like simple controls and pixel-art characters

Not for you if...

−you prefer controlling one fighter over deploying units
−you want an easy path through later levels

What players say

57% of 2,471 reviews are positive · 71% of 14 in the last 30 days

Players praise the straightforward strategy gameplay, and several report finishing the levels without buying units. Many complain that units once obtainable with in-game currency now require paid packs; some also find later levels too difficult.

How many players finish METAL SLUG DEFENSE?

5.7% of Steam players have unlocked «Boss Area 4: "NORTH ASIA N.EAST" conquered », the achievement for finishing the main story.

Share of everyone who owns the game on Steam, including those who barely played it. Updated weekly.

Screenshots and trailer

METAL SLUG DEFENSE system requirements

Minimum: HD, 1 GB RAM, 0.3 GB of disk space.

As published by the developer.

Can my PC run METAL SLUG DEFENSE?

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Minimum

OS: Windows7
Processor: Intel Core i5 2300 and up
Graphics: Intel HD Graphics
Memory: 1 GB RAM
Storage: 300 MB available space
Notes: OpenGL1.3/1.4/2.0/3.0

Does METAL SLUG DEFENSE have co-op or multiplayer?

Yes: multiplayer (mode not specified). It also has a single-player mode.

Does METAL SLUG DEFENSE run on Steam Deck?

Untested Not yet tested by Valve on Steam Deck.

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows
Achievements: 64
Steam features: Cloud saves, Family Sharing
Languages: Full audio: English. Text only: Japanese, French, Italian, Spanish - Spain, Korean, Portuguese - Brazil, Russian, Traditional Chinese.

Does METAL SLUG DEFENSE use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 25, 2026. How to filter AI games on Steam