Note: Unless you are using a severely outdated operating system or CPU, you most likely want to always download the x64 (64-bit) version of Ultimate Doom Builder.
The 64-bit version has less limitations on the total size of the project that you can load and edit, while the x86 (32-bit) version of Ultimate Doom Builder only exists for compatibility with older PCs.
If not sure, follow these instructions to find out whether your system is 64-bit: Which version of Windows operating system am I running?
The 64-bit version has less limitations on the total size of the project that you can load and edit, while the x86 (32-bit) version of Ultimate Doom Builder only exists for compatibility with older PCs.
If not sure, follow these instructions to find out whether your system is 64-bit: Which version of Windows operating system am I running?
All recent versions
Ultimate Doom Builder R4331
26 Sep 2026
Fix VPO native library build and loading on Linux (#1369)
Ultimate Doom Builder R4329
26 Sep 2026
Visual Mode: added map element grouping capabilities (no default keys bound) (#1383)
Ultimate Doom Builder R4328
26 Sep 2026
Make Move To Cursor action teleport to 75% of the distance to the aimed point (#1384)
Ultimate Doom Builder R4327
13 Sep 2026
Fixed URL to the ZDoom wiki in the DSDADoom UDMF, Helion UDMF, and ZDoom based UDMF game configurations.
Ultimate Doom Builder R4326
06 Sep 2026
Fixed a bug where the lightfog sidedef UDMF property was disabled when changing a sidedef's brightness.