Hmmm...there was that game where you were at a couple's home, and you just talked to them. I guess you could call that puzzle-less, unless you'd consider their relationship the puzzle. I don't know, I consider branching conversations, open environments, even simply just interacting with a game's world all puzzles, in a way. Definitely sounds intriguing, though. Hewck, I'd play it, just for the curiousity factor!
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