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 R4320
24 Jun 2026
Add forward-compatible flag to core GL context request (#1360)
Ultimate Doom Builder R4319
24 Jun 2026
Fix visual mode spin with absolute raw mouse input (#1359)
Ultimate Doom Builder R4318
07 Jun 2026
Sectors Mode: fixed a problem where merging sectors would not apply the correct properties when the first selected sector was completely enclosed by other selected sectors
Ultimate Doom Builder R4317
25 May 2026
The temporary map WAD file is not immediately deleted after testing anymore. It will also use the same file name during the session.
Ultimate Doom Builder R4316
15 May 2026
Fixed comments docker getting bogged down by continious redraw calls (#1345)