Modifications are not officially rated by boards like the ESRB. Users should research the content of a mod, as many (including HDoom) contain adult themes that are not suitable for all audiences.

As the most common encounter in the mod, the Imp received an immense amount of polish. It features the highest number of transitional frames, meaning the shift from a neutral "combat" state to an "interaction" state looks incredibly smooth. It serves as the baseline proof-of-concept for the entire mod's engine. How to Experience HDoom Safely and Properly

The mod features custom-drawn frames that replace the standard movement and attack patterns of the original enemies. These animations are designed to match the new character designs, providing a unique visual experience within the familiar gameplay loop.