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 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)
Ultimate Doom Builder R4312
14 May 2026
Ignore Build folder (#1337)