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UEFN v39.10 Update : LEGO® NINJAGO®, Mobile UI Tools & In-Island Transactions API Change

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UEFN v39.10 Update : LEGO® NINJAGO®, Mobile UI Tools & In-Island Transactions API Change

Fortnite v39.10 Ecosystem Update: What UEFN Creators Need to Know

Fortnite v39.10 is a creator-focused update that hits three high-impact areas at once: brand content expansion (LEGO® NINJAGO®), mobile-first UX improvements, and a critical Verse API change for in-island transactions ahead of publishing opening in early 2026.

If you’re building LEGO experiences, optimizing for mobile discovery, or preparing to ship monetized islands with V-Bucks purchases, v39.10 includes both new opportunities and one immediate action item that you should handle before your next playtest.

This article summarizes the key changes in v39.10 and what they mean for UEFN creators. For full release notes, implementation steps, and official restrictions, please review Epic’s v39.10 documentation.

Action Required: Verse API Change for In-Island Transactions

The most urgent change in v39.10 is a breaking rename in the Marketplace Verse module.

What Changed

What You Need to Do

If your project uses the experimental release of in-island transactions, you must:

Epic has also updated:

If you’re unsure how to refactor your implementation, start by opening the updated example and mirroring the new structure.

Publishing Status Reminder

For v39.10:

That means: you can build and validate now, but you cannot publish transaction-enabled islands to players until the January go-live window.

Ask Epic: Mobile Development in UEFN (December 18, 11AM–12PM ET)

Epic is running an “Ask Epic” forum session focused on mobile development in UEFN.

Expected topics include:

Creators can submit questions in advance via the forum post. If mobile performance is a priority for your island (or your retention depends on mobile usability), this is a high-value event to track.

LEGO® NINJAGO® Content Arrives (Starter Island + Themed Assets)

The headline content drop in v39.10 is LEGO® NINJAGO®, including a new starter island template and themed assets designed to jumpstart ninja-style LEGO experiences.

NINJAGO Starter Island Template (Art Template)

Creators can kickstart layout and art direction using the NINJAGO Starter Island template, which includes:

This template is designed to remove early production friction, letting teams iterate quickly on gameplay layers and progression systems.

New LEGO Styles for NPCs

Four NINJAGO-themed LEGO Styles are available for NPC creation via NPC Spawner:

These styles add recognizable character identity and support narrative and mission-driven LEGO islands.

Weapons: Shuriken, Nunchuck, and a LEGO-Fit Kinetic Blade

LEGO NINJAGO introduces:

It also brings the Fortnite Kinetic Blade, redesigned to fit Minifigures—giving LEGO creators a stylish melee option with strong gameplay potential.

Props and Brick Modules

The NINJAGO Props Gallery includes training and dojo-themed assets to support:

UEFN projects can begin with Ninjago Monastery brick modules and expand using Brick Editor.

Brick Editor Updates: 23 New Bricks

To support deeper LEGO building workflows, v39.10 adds 23 new Brick Editor bricks, increasing flexibility for:

Epic recommends reviewing Brick Editor documentation for details on the new parts.

Mobile UI Enhancements: Cleaner Interfaces on Small Screens

v39.10 continues the mobile-first push with UI tools aimed at reducing clutter and improving readability.

Cinematic Sequence Device: Hide Unused Mobile Inputs

A new option allows the Cinematic Sequence device to hide unused mobile inputs during active cinematics.

Popups: Hide Mobile Inputs During Interaction

Mobile gameplay inputs (jump, crouch, fire) are now hidden when players interact with popups. This reduces accidental input and improves touch UX.

HUD Controller: Vehicle UI Hide/Show + Verse API Expansion

Two new HUD Controller settings allow creators to:

In addition, new vehicle HUD fields are exposed to Verse, including:

This enables creators to replace default vehicle UI with custom, island-specific vehicle HUD experiences—especially valuable for racing, open-world, or extraction-style modes.

Debug Commands: Infinite Ammo Controls

Two new Beta Debug Command menu options help creators test weapon balance and combat scenarios:

These are practical tools for rapid iteration and QA.

New Content: Twinkle Terrace Prefabs and Galleries

v39.10 adds a new themed environment set:

These assets are suited for stylized hubs, social spaces, or narrative districts.

Device Updates and Physics Fixes

v39.10 includes multiple targeted fixes, including:

It also confirms continued fixes for known high-friction issues:

New Device Design Examples: Visual Effect Powerup

Epic adds new Visual Effect Powerup Device Design Examples, showing how to:

These examples are useful for onboarding flows, item pickups, and event-driven UI/VFX communication.

Community Bug Fixes and Creator Workflow Improvements

Community-driven fixes include:

Additional UEFN workflow fixes include:

Scene Graph and Custom Items updates include:

Verse updates include:

Unreal Revision Control performance improvements specifically target creator-reported lag caused by overly frequent status checks.

Final Thoughts

Fortnite v39.10 is a strong December creator update: LEGO® NINJAGO® expands the LEGO ecosystem with a high-utility starter template, mobile UI enhancements make touch experiences cleaner and more controllable, and in-island transactions continue their march toward publishing—with one important requirement: update your Verse Marketplace code from product to entitlement.

If you’re building for the January 9, 2026 monetization window, v39.10 is a must-read and a must-test release.

For full technical details, updated examples, and the official rule framework, creators should review Epic’s v39.10 documentation : 39.10 Fortnite Ecosystem Updates and Release Notes

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