From Verse Builder to UEFN

Prerequisites

• UEFN installed (create.fortnite.com).
• A UEFN project open with the Verse plugin enabled (default).
• A Verse Builder project ready to export — at least one rule and Game Data configured.

Step 1 — Export the code

1. 1

   Open the Code tab

   In Verse Builder, click Code in the activity bar (or press ⌘ + . to peek). For multi-device projects, each device gets its own file.
2. 2

   Check for errors

   Look at the top banner. If it's green (no errors) you're good. If red, fix the listed validation issues first — your code won't compile until they're cleared.
3. 3

   Copy

   Click Copy code at the top of the file. For multi-device projects, copy each device file separately.

Step 2 — Paste into UEFN

1. 1

   Open the Verse Explorer in UEFN

   From the UEFN top menu: Verse → Verse Explorer. Your project tree appears.
2. 2

   Create a new device file

   Right-click your project's VerseDevices folder → New file. Name it after your device (the file name should match the class — e.g. my_device.verse).
3. 3

   Paste the code

   Open the file (UEFN opens it in VS Code if installed, otherwise its built-in editor). Replace its contents with the copied code.
4. 4

   Build Verse code

   In UEFN: Verse → Build Verse Code. If the build is green, your my_device actor now appears in the Place Actors panel.

Step 3 — Place and wire devices

1. 1

   Drop the device on the island

   From Place Actors, search for your device class and drag it into the level. It has no visible mesh — that's fine.
2. 2

   Wire @editable bindings

   Select the device. In the Details panel you'll see one field per @editable property. Drag the matching UEFN actor into each: a Button device, a Volume device, an Elimination Manager, etc.
3. 3

   Tune the configs

   Any @editable number or float you exposed via Config appears here too. Set them to your desired values — this is where designers tune balance.

Step 4 — Test in session

Hit Launch Session in UEFN. You'll spawn into your island with the rules running. Trigger the events you wired (eliminate a player, enter a volume, press a button) and confirm the behavior matches what you designed in Verse Builder.

Common issues