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 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)
Ultimate Doom Builder R4315
15 May 2026
Changed how ZScript tokenizer handles EndOfStream (#1346)
Ultimate Doom Builder R4314
15 May 2026
Fixed ImageData Rounding error which made floors coordinates drift at large values (#1344)
Ultimate Doom Builder R4313
14 May 2026
Minor plane-related fixes and improvements (#1340)