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Are the Knowledge Cards supposed to be hidden from the other players but freely talked about (ie Pandemic), hinted at (ie Shadows Over Camelot) or just for the owner to do with when he/she sees fit (which seems to counter the co-op theme)?
I left it vague in the rules intentionally - play how your group likes to do it. Officially, all cards are open information so feel free to share them. Or you can just talk about them but not reveal them. Or keep them hidden if you really want. I tend to play with them revealed.
Hope you're enjoying the game!