DWG-106.2.06
Bridges #6 · Medium
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About this puzzle
16 islands on a 9×9 grid need 20 bridges between them. The biggest island number is 7.
2 islands need at least one bridge to every neighbour.
Where to start
3 islands take the maximum their neighbours allow, so every connection there is a double bridge.
A good first move: the island with the number 4 at row 9, column 3, which can see 2 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.