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What are these telltale games? Are they interactive novels? shooters? RPGs? I had a quick watch of somebody playing the Game of Thrones one on Twitch and it seemed to be all dialogue with the player choosing different replies.
i would say an interactive story, but you do get to move around and investigate e.g. click X to read, pickup etc
and then conversations and decisions have an impact on the story, like you decide to save one person and then the other person will die...
i love em, The Walking Dead had a brilliant story and the ending was a chocker