Individual Challenges
I've been in several stories where people either get split up, or they have have choices they are given to make, alone.
If the Narrator could create a challenge, and have an option of who is allowed to answer it, I think that would help spice things up, rather than present a challenge and only asking certain people to take it (provided the players are honorable enough to).
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Jay commented
It's very common that a challenge is intended for one player and not others, or that a certain portion of it is. I see narrator's explicitly type out who should address what and how much. It would be nice if there were an in-game way to limit how many cards each player can play toward certain challenges.