HDoom is a pornographic modification, being developed by Mike12 (aka HDoomGuy), for Doom. The modification replaces the game’s weapon and enemy animations with hentai, turning most demons into nude female counterparts and adding adult animations for the Doomguy.​

• Manual Installation:
• 1- Download the GZDoom archive that matches your OS and extract it to the desired location.
• 2- Download Freedoom and m12-hdoom_techdemo9 and extract/move them to where the gzdoom.exe is located at.
• 3- Drag "m12-hdoom_techdemo9.pk3" onto gzdoom.exe and then wait until the IWAD selection window shows up.
• 4- In the IWAD selection window, select Freedoom: Phase 1 and click on "Play GZDoom" to start playing.
• Standalone (Windows Only):
• 1- Extract to desired location.
• 2- Drag "m12-hdoom_techdemo9.pk3" onto gzdoom.exe and then wait until the IWAD selection window shows up.
• 3- In the IWAD selection window, select Freedoom: Phase 1 and click on "Play GZDoom" to start playing.

• Dual Core Pentium or equivalent Processor.
• Intel HD 2000 or equivalent Graphics.
• 71.2 MB of free disk space (Recommended to have twice as much free disk space than this).