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The standard form of this puzzle consists of a set of circled numbers aligned to a grid (which is not otherwise given). To solve it, add some horizontal or vertical "bridges" between the circled numbers such that the number of bridges terminating at each number is the same as that number. At most two bridges may extend in each direction from a number, and bridges never intersect or jump over numbers.
MIT Mystery Hunt 2010 Round 11 Meta
MIT Mystery Hunt 2011 Nik-holey
MIT Mystery Hunt 2014 Magic Mushrooms
MIT Mystery Hunt 2015 Hashi It Out
MIT Mystery Hunt 2016 Toll Bridges
MIT Mystery Hunt 2017 Attention Span