The Player is one of two key components that you need in order to play a PCG. In order for a player to play a PCG they must have a PCG Master that guides them through the game.
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The player is sometimes responsible for creating an Inventory Screen (though in the original pcgs, Chris would make them, as did Xaq and others), talking to NPCs, Exploring, and overcoming obstacles. A good player asks questions about what they see in the screens. Players must also be observant and not give up right away if what they try on a puzzle doesn't work.