I'd say Riviera (for handheld systems). It hasn't got much of a plot, or at least not a memorable one (I don't remember it.). But the part of the gameplay that's for the fiction side of the game (wandering around, character interaction) is the most classical-adventure-ish fiction gameplay I've ever played through in an RPG. I'm not sure why that's a big deal, but there you have it.
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