In The Sorcerer's Stone Harry and Quirrell have to get through a series of challenges to get the stone. But they all have a solution. For example, the flying keys: you find the right key, you get through. The chessboard: win the game, you pass through.

Why wouldn't Hogwarts simply put a spell on it that allowed no one to pass except Dumbledore, Nicolas Flamel, and a few others? I am sure there are spells that could do that, so why weren't they used?

marked as duplicate by Robert Columbia, DavidW, Bellatrix harry-potter Apr 13 at 3:56

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    Why are you sure? – Adamant Apr 13 at 2:05