Those who have played the original DOOM, know how crazy hard the Nightmare difficulty is. Much faster demons and in greater numbers, faster and more accurate projectiles, they react instantly to your presence and they respawn on an average of 5 to 30 seconds after being slain. Very difficult stuff!
DOOM's (2016) doesnt tweak the demons behaviour on Nightmare difficulty. Instead, it simply makes the demons do 90% more damage. It is by no means easy and most demons can two shot or even one shot (depending on their attack) you quite easily with combat becoming a razor's edge.
Ultra Nightmare takes the challenge even further beyond the point 9f masochism! It is Nightmare except you cannot die a single time ever! If you die, you have to start the game all over again. Incredibly punishing.
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