A classic, in your browser

Doom 3 Demo

Explore a failing Mars facility in a slower, darker Doom built around close encounters and survival horror.

Desktop

Play the free demoOpens the community project in a new tab.

Before you jump in

This is Continuation Labs’ d3wasm demonstration using Doom 3 Demo data. It contains a limited sample of the original game, not Doom 3 BFG Edition or the full campaign. Let the initial download finish, then start a new game from the menu. A desktop keyboard and mouse are the practical way to move, aim and use the port’s special menu keys.

Project page & credits

Game files: Demo included; full game needs your files
Controls: WASD and mouse; Home opens the menu or skips cinematics; Insert opens the console
First launch: Allow time for resources to load

Start here

How to play Doom 3 Demo in your browser

Open the demo and wait for the data download and engine initialization to finish.
Use the main menu to begin a new game and choose a comfortable difficulty.
Click the game to focus the mouse; use WASD to explore, and check the in-game bindings for weapons and interaction.
Use Home when you need the menu or want to skip a cinematic. Review save/load options there before ending a session.

Project information reviewed 2026-10-16. The game runs on the linked project’s website.