I think that a UHS-style system is an excellent move, ESPECIALLY when there are fake questions included to reduce the spoiler risk.
That said, the very best possibility is when a game includes gradual, contextual hints. Some modern text adventures have UHS-style hint menus that only show topics that are currently relevant, and I know that the Telltale games also have some hinting built in.
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The Sapphire Witch cordially invites you to a labyrinth of riddles and mysteries, The Witch's Epigraph.
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