OX writes: Thought Cuphead was a cutesy platformer you could breeze through in an afternoon? Not a bit. Cuphead is instead a gauntlet of insanely difficult boss battles that will require all of your gaming skills and then some. Essentially, this is an old-school, hardcore retro shooter that just so happens to look like a 1930s cartoon. Here are five bosses from Cuphead who will straight-up ruin your life. Spoilers ahead."