I may be wrong, as I haven't yet got my last argent cell to max out capacity, but I believe that is what others are saying.and considering that both are very low on global percentage list, it appears to work that way. to beating the game at the highest difficulty. one at developer id Software has yet managed to complete Doom’s hardest difficulty mode. They have to be completed before fighting the final boss and finishing the campaign. Nobody Has Beaten Doom's Hardest Difficulty Level. Those you can not 'go back and get' after completion from my understanding. Find sweet spot for waging war against Doom Eternals demonic threats and steer clear of settling for running thats too easy, or punishing. Fully upgrading the praetor suit and collecting enough argent cells to max out health, armor, and ammo capacity. There are five difficulty levels to choose from, and you can switch between these as you see fit. New game in a new slot starts everything over at 0%Ģ achievements to note, if you are concerned about them, are those that specificy 'on a single campaign run'. You also play these levels again with all weapons, upgrades, etc. You CANNOT up it to nightmare or UN, though, you have to start a new game in a new slot to select that option. Doom's Ultra-Nightmare mode is so difficult that nobody at developer id Software was able to complete it.The premise is simple: Take the game's most punishing difficulty setting, Nightmare, then. You can also up difficulty as high as UV if you played through on a lower setting earlier. After completing the campaign you can use the mission select to go back through and get anything missed.

Doom 4 difficulty levels