By Roger Barkan, Dan Katz, and Todd McClary

The given pieces can be reconstructed to form three Hashiwokakero, or Bridges, puzzles, each of which has a unique solution. As illustrated in the example (which spells out EXAMPLE), each boat then spells out a word, as follows:

1) The boat begins by carrying an A.

2) Every time the boat crosses a single bridge, shift the letter on the boat forward in the alphabet by the sum of the two islands connected by that bridge.

3) Every time the boat crosses a double bridge, shift the letter on the boat forward in the alphabet by twice the sum of the two islands connected by that bridge.

4) Every time the boat reaches a buoy, output the current letter.

Doing this for each boat spells out the name of a noted bridge, with one letter missing. These missing letters, ordered by boat number, give the answer CROW’S NEST.

 Boat Number Bridge Name Missing Letter 1 MACKINAC C 2 HARVARD R 3 BROOKLYN O 4 TOWER W 5 ORESUND S 6 LONDON N 7 GOLDEN GATE E 8 BOSPHORUS S 9 RIALTO T