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.
Also called: Bridges puzzle, hashi
Puzzles
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
MIT Mystery Hunt 2018 Hashiwokakuro (Count Your Bridges)
MIT Mystery Hunt 2019 Schematics
MIT Mystery Hunt 2021 Better Bridges
MIT Mystery Hunt 2022 A Wizard of Earthsea
MIT Mystery Hunt 2022 Crooked Crossings
MIT Mystery Hunt 2023 Bridge Building
MIT Mystery Hunt 2023 Hall of Archaeology
MIT Mystery Hunt 2023 Circuit
MIT Mystery Hunt 2023 Reflective Screen
MIT Mystery Hunt 2024 Isle of Misfit Puzzles
Categories