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 R4238
21 Jun 2025
Add lm_dynamic to ZDRayInfo (#1211)
Ultimate Doom Builder R4237
24 May 2025
Added missing Sector Damage line action arguments (#1204)
Ultimate Doom Builder R4236
24 May 2025
Fixed a problem where the "use linux paths" setting in the game configuration settings were not saved between sessions. Fixes #1203
Ultimate Doom Builder R4235
24 May 2025
Add lm_ao and lm_bounce to ZDRayInfo (#1176)
Ultimate Doom Builder R4233
17 May 2025
Added hashes for the Doom + Doom II 1.1 IWADs