Metal Slug 4 for Android

App snapshot

An unofficial mobile adaptation of Metal Slug 4, released by the Hero Apps team, offers a free-to-play, side-scrolling action experience inspired by the original Neo‑Geo arcade release from SNK. The mobile build recreates classic run-and-gun mechanics on touchscreens and supports external controllers for a more traditional feel.

Story and playable roster

Players rejoin the Peregrine Falcon Squad as they confront a new threat: the Amadeus Syndicate, which has allied itself with recurring antagonist General Morden. The cast swaps in two new selectable characters, Nadia and Trevor, who fill the roles previously occupied by Eri and Tarma, while familiar faces Marco and Fio remain available for the signature arcade action.

Core gameplay and mechanics

Metal Slug 4 stays true to the franchise’s 2D side-scrolling roots. Expect intense stages packed with enemy soldiers, mutated creatures, strange aliens, and frantic vehicle sequences. Notable gameplay elements include:

• New weapon handling: the 2H (two-handed) submachine-gun mechanic adds a fresh firing option.
• Transformation gimmicks: the game introduces the memorable monkey transformation as a quirky power-up.
• Faithful control mapping: touchscreen controls mirror arcade inputs, and controller compatibility is built in for a console‑like experience.
• Complete content: stages, secrets, and easter eggs from the original arcade release are preserved for fans and newcomers alike.

Audio and presentation

The soundtrack has been carefully reproduced, retaining the compositions associated with the series and the contributions of Toshikazu Tanaka. Visuals reuse many classic assets from earlier Metal Slug titles, so you’ll notice familiar sprites and set pieces alongside the new additions.

Strengths and limitations

Pros:

• Smooth performance and reliable controls on mobile devices.
• Preserves most of the original content, including hidden elements.
• Introduces small, interesting gameplay tweaks and additional characters.

Cons:

• A number of visual and level elements are recycled from previous entries, which may feel repetitive to long-time fans.
• The replacement of longtime characters (Eri and Tarma) with new faces may not appeal to every series enthusiast.

Other Metal Slug titles to try

• METAL SLUG X
• METAL SLUG 3
• Metal Slug: Awakening

Final impression

Overall, this unofficial mobile port is a solid adaptation that brings Metal Slug 4’s arcade action to phones and tablets. While veteran players will recognize recycled content and might miss some classic characters, the game runs well and adds a few fresh mechanics—making it a recommended pick for both newcomers and fans seeking a portable Metal Slug fix.