DWG-106.2.01
Bridges #1 · Medium
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About this puzzle
17 islands on a 9×9 grid need 21 bridges between them. The biggest island number is 5.
5 islands need at least one bridge to every neighbour.
Where to start
A good first move: the island with the number 5 at row 6, column 8, which can see 3 neighbours.
At least once, a pair of islands would seal itself off from the rest if you joined it the obvious way. Avoid that and the rest follows.