Add 2015 Christmas Puzzle Hunt

Both as one big PDF file and also as a bunch of single-page PDF files
with image previews on the HTML page.

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+[[!meta title="Carl's Christmas Puzzle Hunt 2015"]]
+
+[[!tag puzzles]]
+
+Welcome to the 2015 edition of Carl's Christmas Puzzle Hunt. If you're
+wondering what all of this is about, you can read the [history of my
+Christmas puzzles](../).
+
+Since I designed these puzzles for my sons, some of the artwork and
+imagery will have more meaning to them than it would to anyone
+else. But the puzzles themselves are all designed so that they can be
+solved using only general knowledge and logic.
+
+The puzzles this year include word games (anagrams, cryptograms),
+logic puzzles (sudoku, star battle, fillomino, yajilin), and other
+classic puzzles (riddles, mazes, etc.) as well as a few unique
+surprises. Of course, there's also a big meta-puzzle to pull it all
+together.
+
+I'm very interested in any feedback you might have, positive or
+negative, about puzzles, themes, difficulty, etc. So please share
+whatever comments you have. I'm also happy to confirm solutions to any
+puzzles in the hunt or to provide additional hints if needed. So feel
+free to email me at: [Carl Worth <cworth@cworth.org>](mailto:Carl
+Worth <cworth@cworth.org>).
+
+The puzzle hunt is available in two forms:
+
+## Complete puzzle hunt (30-page PDF)
+
+Download the [Complete Puzzle Hunt](code-2015.pdf).
+
+## Individual Pages
+
+I designed these puzzles for my four sons at Christmastime. When we
+placed their gifts under the tree, we didn’t put any names on them,
+but instead each gift had one of the 16 rather puzzling tags you can
+find below. A correct solution for all of the puzzles will allow the
+solver to determine which of my sons should receive each gift. (My
+sons are named Cameron, Hyrum, Andrew, and Scott)
+
+(Click on thumbnails for single-page PDF of each puzzle)
+
+### Gift Tags
+
+<a href="code-2015-01.pdf"><img src="code-2015-01.png"></a>
+<a href="code-2015-02.pdf"><img src="code-2015-02.png"></a>
+<a href="code-2015-03.pdf"><img src="code-2015-03.png"></a>
+
+### The Ornament Puzzles
+
+<a href="code-2015-04.pdf"><img src="code-2015-04.png"></a>
+<a href="code-2015-05.pdf"><img src="code-2015-05.png"></a>
+<a href="code-2015-06.pdf"><img src="code-2015-06.png"></a>
+<a href="code-2015-07.pdf"><img src="code-2015-07.png"></a>
+<a href="code-2015-08.pdf"><img src="code-2015-08.png"></a>
+<a href="code-2015-09.pdf"><img src="code-2015-09.png"></a>
+<a href="code-2015-10.pdf"><img src="code-2015-10.png"></a>
+<a href="code-2015-11.pdf"><img src="code-2015-11.png"></a>
+<a href="code-2015-12.pdf"><img src="code-2015-12.png"></a>
+<a href="code-2015-13-15.pdf"><img src="code-2015-13.png"></a>
+<a href="code-2015-16.pdf"><img src="code-2015-16.png"></a>
+<a href="code-2015-17.pdf"><img src="code-2015-17.png"></a>
+<a href="code-2015-18.pdf"><img src="code-2015-18.png"></a>
+<a href="code-2015-19.pdf"><img src="code-2015-19.png"></a>
+<a href="code-2015-20.pdf"><img src="code-2015-20.png"></a>
+<a href="code-2015-21.pdf"><img src="code-2015-21.png"></a>
+<a href="code-2015-22.pdf"><img src="code-2015-22.png"></a>
+
+### The Final Puzzle
+
+<a href="code-2015-23.pdf"><img src="code-2015-23.png"></a>
+
+### Hints and Credity
+
+CAUTION: There are some (mild) spoilers in this section. Consider
+yourself warned.
+
+<a href="code-2015-25-30.pdf"><img src="code-2015-25.png"></a>

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+[[!meta title="Puzzles"]]
+
+[[!tag puzzles]]