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I had a hard time getting the hang of scope the variables and functions in Javascript. By messing around with the way the function was defined I was able to call the scoreThisWord function in the Player object (even though it had been defined in the Scrabble object), but I don't know why it works and if that was an acceptable way to do it. Instead of "Scrabble.prototype.scoreThisWord = ", I used "Scrabble.scoreThisWord = ".