In Fallout 4, there are myriads of hidden bosses and mini-bosses that players can seek out and find for themselves. Some of these bosses are harder than others, but the most challenging part for most of them will just be finding them. Of course, if you stumble across a mini-boss unaware, that can also cause some frustration if you are not prepared for what you accidentally found. Navigating both of these challenges is what makes the Fallout games as iconic as they are.