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Latest release is 2.3.0.0709 for Windows, macOS and Linux | changelog

Getting started & Basic Navigation - Begin here

Basic-concept: Brushes - the fundamental building blocks of a level

Entities (Things) - Monsters, Weapons, Lights & Speakers

Triggers & The I/O Logic System - make stuff happen in a level

Procedural level generator - Playable liminal spaces with one click

UI:

Logic Graph Editor - Visual Scripting system

Asset Browser - Textures and Models

Property editor - Settings & Flags

Scene Hierarchy - Tree view of all brushes + entities

System Monitor - Frame times & frustum culling

Technical:

 FIO
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 ┌──────────┴──────────┐
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 EDITOR ENGINE
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 Brushes Renderer Physics Logic
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 └──────────┴──────────┴──────────┘
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 World system
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 BigWorld
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 Streaming Persistence
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 Cell state UUIDs
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 Save / Delta

Plugin API - Create Plugins to extend functionality

Map Format - structured plain UTF-8 JSON files

.fiopak archive format for sharing created worlds

Renderer Technical overview - Architecture

Current Limitations