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If the game pits the players against each other, they will be tempted to cheat and look. And if they AREN’T pit against each other, they’ll peek and argue they aren’t cheating.
In other words, I want only those intended to read it to be able to. -
In short, that’d be extremely unwieldy due to a combinatoric explosion. Imagine 6 players. Just to have each player be able to privately talk to each other you’d need (6 choose 2) categories. 3 people want to talk to each other? That’s 6 choose 3, etc. You get the idea.