Ultimate Doom Builder

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Ultimate Doom Builder
UDB Win.jpeg

Screenshot of Ultimate Doom Builder R4096.

Codebase GZDoom Builder
Developer(s) ZZYZX, Boris Iwanski, Max Waine (Altazimuth), Magnus Norddahl (dpJudas)
Initial release (2019-12-24, 4 years ago)
Latest release (2024-02-03, 2 months ago)
Development status Active
Written in C#
Target Platform Windows
License GPL-3.0
Source Repository


A timeline of Doom Builder versions and forks.

Ultimate Doom Builder (or UDB for short) is a level editor for the Doom engine games specifically aimed at the ZDoom and GZDoom source ports. It was created by ZZYZX and is a fork of GZDoom Builder by MaxED, which was discontinued in January 2017. UDB is now mostly maintained by Boris Iwanski, who received a Codeaward at the 2022 Cacowards for his submissions to it.


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As GZDoom Builder-Bugfix[edit]

  • The last release of GZDoom Builder occured on January 9, 2017, after which it was discontinued.
  • ZZYZX decided to keep maintaining the GZDB in the absence of its creator, and created a fork named GZDoom Builder-Bugfix on January 14, 2017.[1]

As Ultimate Doom Builder[edit]

  • Ultimate Doom Builder was first released as v3.0.0.3050 on December 24, 2019.[2]
  • v3.0.0.4090 was released on August 15, 2023.


  • Graf Zahl did not like that the name GZDoom Builder refers to GZDoom. A week before GZDB Bugfix became a standalone editor, he suggested calling it Ultimate Doom Builder. This title not only implies that UDB is an improved version of GZDB, but is also a nice nod to The Ultimate Doom.[3]

See also[edit]

External links[edit]


  1. ZZYZX (14 January 2017). ZDoom forums thread. ZDoom forums. Retrieved 18 August 2023.
  2. ZZYZX (24 December 2019). ZDoom forums thread. ZDoom forums. Retrieved 18 August 2023.
  3. Graf Zahl (18 December 2019). ZDoom forums post. ZDoom forums. Retrieved 18 August 2023.
Source code genealogy
Based on Name Base for
GZDoom Builder Ultimate Doom Builder None