WHAT'S THIS ABOUT MOUSEHOLES?
The letter is very clear. There are mouseholes in the upstairs hall.
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Go check if you don't believe it.
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Walk to the end of the hallway to find mouseholes and golf balls.
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If you feel the sudden urge to play some mini golf, don't try to repress it.
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You should already have a golf club, after all.
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But every good game has its rules.
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Which hole should you aim for first?
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Go back to the billiard room for a clue.
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The words Pocket and Order in the letter stand out.
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Pocket as in …
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Have you looked at the billiard table?
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There are four balls in the pockets now that weren't there before.
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Maybe these tell you the correct order?
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The billiard table in this case represents the hallway. Its right side is the wall you're facing as you look at the mouseholes.
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First goes the hole furthest from you on the left, then the hole closest to you on the right, next the one closest to you on the left, and lastly the one furthest to you on the right.
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Go back upstairs and use the golf club on the balls in the correct order. The mouseholes will close.
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Go back down to the billiard room to see what you've accomplished.