I have been stuck on many a puzzle game with puzzles that give you next to no hints and what to do, but one particular puzzle in a game that would have infuriated me were it not for the internet is the puzzle in part 5 of The Curse of Monkey Island where you are turned into a child and have to make yourself and adult again. The solution? The hangover cure recipe from earlier in the game using eggs, pepper and hair of the dog that bit you.
Like, how is a hangover cure supposed to make you into an adult again when you’ve been cursed? How on earth were you supposed to work that out?! And since when is the spice pepper the same as the vegetable which you also used for the recipe earlier in the game?
Every side quest in every FromSoftware game.