or it can be a set of clues to uncover the truth of a mystery, conspiracy, a web of lies or other the pre-written truths designed by the organisers.
The metaphor of the bag of marbles is used in figuring out probability in math. The idea is that a participant at a larp will encounter clues or incentives at a larp-game in much the same way as someone pulling random marbles out of a bag. The metaphor of the bag of marbles is used in figuring out probability in math.
(The math behind it is described as the "Bags of Marble" puzzle and can be searched on the internet using "math theory" & "bag of marbles").