Metal Mutant

About

The engine rewritten in JavaScript routine by routine, checked frame by frame against the original, running the scripts, graphics and PC speaker sound of your own copy. Nothing is uploaded.

Metal Mutant is a side-scrolling action-adventure game developed and published for MS-DOS, Amiga and Atari ST by Silmarils and released in 1991. It is similar to Game Arts' Thexder in that it allows you to transform at any time into three different robot forms (Cyborg, Dino and Tank).

Description from IGDB.

How it runs

Project

metal-mutant-webReimplementation. A new engine written from scratch that runs the original game's data.License: MITAbout this project

Port

kznsq.github.ioBy kznsq · JavaScriptOnline since Oct 5, 2026

Controls

Arrows walk and climb, Shift fires, F1 to F3 change form, Shift + End saves under a survival module, Esc pauses.

Plays with

Keyboard. Saves in your browser.

You need

Bring your Metal Mutant folder (MAIN.IO and the other .IO files, CAC40.FIC and SOS.FIC): the port runs it, it does not ship it.

Original

Silmarils, 1991, DOS

Under the hood: every project behind it, its license and code, how they connect, and who made them.