Brutal Doom is a mod for the original Doom that, after three years of intense development, now offers a much bloodier and more refined experience (especially with regard to the shooting mechanism) compared to the normal game. You'll notice the increased goriness of Doom not just in the increased blood splatters on the walls and the bodies of enemies, but also in the new options that allow you to shoot people in the head or tear your enemies apart with bullets. Also, almost all of your opponents will now have completely new death animations. Doom's normal shooting system, which didn't use the mouse by default, has been updated so that it does. Although the best part is that the weapons have been completely remodeled so that no one weapon is significantly better than the others. For example, the sawed-off shotgun is your best choice at short range, while the machine gun will prove to be your best friend against big groups of enemies. Brutal Doom is one of the best Doom mods out there because it allows you to enjoy all the levels of the original titles, with a bloodier and more entertaining facelift that also looks much better.
