Welcome to Verse Builder

What is Verse Builder?

Verse Builder is a browser app for creating UEFN gameplay logic without writing Verse by hand. You assemble rules and game data using a visual editor; the Composer compiles them, deterministically, into Verse files you paste into UEFN.

It's not a runtime, not a wrapper, not a plugin. It's a generator. The code that runs on the player's machine is the code the Composer produced — you can read it, audit it, even edit it if you want.

Who is it for?

• UEFN creators who don't code — build logic richer than drag-and-drop devices alone can express.
• Designers who code a little — prototype fast, then read the generated Verse to learn patterns.
• Teams of any size — Verse Builder projects are JSON; you can version them, review them, share them.

How does it work?

Three things to know to start being productive:

• Devices — one project = one or more device files. Each device becomes a Verse class you place on your UEFN island.
• Rules — the WHEN/IF/DO logic. Each device has a list of rules you can reorder, duplicate, and group.
• Game Data — variables, configs, phases, messages, inventories. State your rules read and write.

Where to next

Three paths from here, pick whichever fits:

• Build something now → Your first rule — a 5-minute walkthrough from blank project to a working rule.
• Understand the model → start at Core concepts and read forward.
• Find a pattern → Recipes ship end-to-end gameplay loops you can adapt.