Ultimate Doom Builder is a modern, Windows-based level editor for classic Doom-engine games, developed by ZZYZX. Evolving from the Doom Builder and GZDoom Builder lineage, it delivers a fast, visual workflow with a real-time 3D editing mode, precise texture alignment, and robust geometry tools. It supports classic Doom and Hexen formats as well as the Universal Doom Map Format (UDMF), and is fully equipped for advanced features used by contemporary ports, including slopes, 3D floors, dynamic lights, portals, and polyobjects. Built-in error checking, resource management for WAD/PK3 files, and multiple game configurations (Doom, Heretic, Hexen, Strife) streamline setup and iteration. Ultimate Doom Builder integrates with external node builders and source ports for one-click playtesting, and it recognizes DECORATE and ZScript definitions for accurate thing placement. With powerful drawing utilities, prefabs, customizable hotkeys, and an extensible architecture, it’s a go-to tool for both newcomers and veteran mappers creating anything from vanilla-compatible levels to feature-rich GZDoom projects.
Ultimate Doom Builder is developed by ZZYZX. The most popular versions of this product among our users are: 1.0 and 3.0. The name of the program executable file is Builder.exe.
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