A non-Nightmare campaign can be upgraded only to Ultra-Violence, so you might have to start a new one. If you find yourself bored, raise the difficulty, preferably to Nightmare. This is about single player only I haven’t tried the PvP. Note: check the accompanying post Game Impressions: Doom 2016 for my thoughts on the game and an analysis of what makes it enjoyable. General tips, notes on difficulty, enemies, runes, weapons
