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DMZ CODEX · HAJIN EXCLUSION ZONE UPDATED 27 OCT 2026

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DMZ CODEX · IN-GAME OVERLAY

Stay in game.
Keep your edge.

Check the Hajin map, look up loot and find your next objective right over your game. No Alt-Tab. No browser search. No phone or tablet to reach for.

Get the Windows app

Windows PC · Opens the app store

See what’s inside
DMZ Codex promotional artwork with the Hajin map interface, a tactical Operator and an extraction helicopter in a cinematic exclusion-zone scene
MW4 DMZ companion

Your map. Your answers. On the screen you’re playing on.

KEEP YOUR FOCUS ON HAJIN

One screen.
Everything closer.

Stop switching between your game, browser tabs and another device. Open the Codex, check what you need, then return to your run.

Hajin map

Find your next move.

Check locations, map layers and grid coordinates over your game. Plan where to head next without opening a browser tab.

Loot & crafting

Know what to keep.

Unsure whether to keep an item? Look up loot and crafting information in the overlay, with FOB progress close at hand.

Missions & more

Keep the Codex close.

Check missions, Orders, weapons and threats from one sidebar. Keep your phone on the desk and your reference on the game screen.

FROM DESKTOP TO DEPLOYMENT

Ready for
your next run.

Install the Windows companion once. Bring up your DMZ map and reference when you need them, without switching out to your browser.

View the app listing ↗

  1. Get DMZ Codex

    Open the app listing and follow the Windows installation instructions.

  2. Launch your companion

    Open DMZ Codex and check the app’s settings before you play.

  3. Bring up the Codex

    Use the in-game overlay when you need the map or a quick reference.

BEFORE YOU DEPLOY

A few things
to know.

What is the DMZ Codex in-game overlay?

It is the Windows companion app for MW4 DMZ. Open the Codex over your game to consult the Hajin map and browse reference information while you play.

How is this different from the mobile app?

The Windows app provides the in-game overlay. The mobile companion installs from your browser and keeps the Codex on your phone or tablet. Choose the version that fits where you play.

Do I need to Alt-Tab to use the Codex?

The in-game overlay brings the Codex over your game, so you can check the map or look up information without switching to a browser. Close the overlay when you’re ready to carry on.

Do I need a phone, tablet or second monitor?

No. The Windows overlay keeps the Codex on the screen you already play on. A phone or tablet is optional if you prefer a separate companion screen.

Where does the download button take me?

It opens the app’s store listing, where you can review the current installation details and download the Windows app.

Can I use DMZ Codex on my phone or console?

You can use the website on your phone or install the mobile companion beside your game. The in-game overlay is for Windows PC.

DMZ CODEX FOR WINDOWS

Know Hajin.
Get out alive.

Get the Windows app

Windows PC · Opens the app store

Playing with a second screen? Get the mobile companion ↗

Report a problem on this page
Prepare the next run

My deployment

Check off goals during your run. Saved on this device.
DMZ CODEX · IPHONE & IPAD

Add to your Home Screen

Installation won’t start automatically. Follow these steps in Safari.

  1. 1. Open this site in Safari

    Already in Safari? Continue below. In another app, choose Open in browser, then open Safari.

    dmzcodex.com/install/
  2. 2. Tap Share

    Look for the square with an arrow pointing up. It may be inside Safari’s More (…) menu.

  3. 3. Add to Home Screen → Add

    Scroll through the Share menu; tap View More if needed. Keep Open as Web App on if shown, then tap Add.

Look for the yellow DMZ Codex icon on your Home Screen.