If you'd like to see some examples of what the puzzles are like, you
can look at them here (or even try solving them yourself):
+ * <a href="2015">2015 Christmas Puzzle Hunt</a>
* <a href="/2014">2014 Christmas Puzzle Hunt</a>
* <a href="/2013">2013 Christmas Puzzle Hunt</a>
* <a href="/2012">2012 Christmas Puzzle</a>