Is this the real DOOM?

Yes — id Software's DOOM (1993) running through GZDoom compiled to WebAssembly (UZDoom). The page also ships Freedoom, the open-source replacement assets that play the same maps without proprietary content.

Do I need to install anything?

No. DOOM runs entirely in your browser. There's nothing to install, no plugins, and no account. WAD files stream from disk on first load and cache locally for instant replay.

What flavors of DOOM are included?

Seven: Classic DOOM (the 1993 original), Freedoom (open-source assets), Legend of DOOM (a Zelda-themed total conversion), Mario DOOM (Valigarmander's MarioDoom mod), Metroid DOOM (Spram's Metroidvania conversion), Castlevania: Simon's Destiny (Batandy's standalone first-person Castlevania), and Sonic DOOM (AeriaVelocity's Sonic the Hedgehog in DOOM: Legacy Edition). All seven are launchable via the flavor picker on the start screen.

What are the controls?

WASD or arrow keys to move, mouse to aim, left-click to fire, space to open doors, 1–7 to switch weapons, Esc for the menu. The browser pointer-lock API captures the mouse for proper FPS control. On mobile, an on-screen joystick + fire/jump buttons appear automatically.

What is Legend of DOOM, Mario DOOM, Metroid DOOM, Simon's Destiny, or Sonic DOOM?

Legend of DOOM is a fan-made Zelda-themed total conversion. Mario DOOM (MarioDoom by Valigarmander) replaces enemies and weapons with Mario-universe assets. Metroid DOOM (Spram's mod) is a Metroidvania-style conversion using Samus Aran. Castlevania: Simon's Destiny (Batandy's mod) is a standalone first-person Castlevania built on the GZDoom engine. Sonic DOOM is AeriaVelocity's Sonic the Hedgehog in DOOM: Legacy Edition — Sonic movement, rings, boost, and Super Sonic over Freedoom Phase 2, from the author of Sonic: Lock & Load. All five are loaded as WADs alongside the engine.

Is it safe to play DOOM in a browser?

Yes — the entire stack (engine + WAD parser) runs in the browser sandbox. No code reaches your filesystem and no data is uploaded. The site is open source on GitHub.

Why isn't sound working?

Browsers require user interaction before audio can start. Click anywhere on the canvas to unlock sound. If audio is still silent, check that your browser tab isn't muted in the tab strip or in site permissions.

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DOOM POWERED BY UZDOOM-WASM

The full UZDoom engine (GZDoom family) compiled to WebAssembly via the uzdoom-wasm port. Everything stays local — files are stored in your browser and never leave this machine.

DOOM, running in your browser. Click Launch when ready.

Experimental. ~60 MB first-load download. Saves persist in this browser.

Manual mode.

Click Use bundled Freedoom for the IWAD.
(Optional) Upload LegendOfDoom-1.1.0.pk3 (or any other pk3) into Mods .
Hit Launch .

Don't have a mod handy?

Game files click a tile or drop files

IWAD (required) — or use bundled Freedoom No IWAD selected. Mods / PK3s (optional) No mods selected. Multi-select supported.

SoundFont .sf2 (optional — MIDI music) Using bundled SoundFont.

Idle.

Data & settings

UZDoom is GPL v3. This page ships Freedoom (BSD-style), the UZDoom WASM engine, and — for the Legend of DOOM flavor — LegendOfDoom-1.1.0.pk3 (© DeTwelveGames) as an asset fetched at launch. The Mario DOOM flavor ships mariodoom.pk3 by Valigarmander; the Metroid DOOM flavor ships met2.pk3 (Spram's Metroid Doom v2.2, bugfix by OkDoomer174); the Castlevania flavor ships Castlevania.ipk3 (Batandy's Castlevania: Simon's Destiny v1.4); the Sonic DOOM flavor ships sonicdoom-legacy.pk3 (AeriaVelocity's Sonic the Hedgehog in DOOM: Legacy Edition, 2023-04-11). Mario, Metroid, Castlevania, and Sonic assets are © Nintendo / © Konami / © SEGA respectively, bundled here as non-profit fan projects, not endorsed by those companies. Reload with ?manual=1 to upload your own copy instead.

DOOM POWERED BY UZDOOM-WASM

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