DWG-106.4.03
Bridges #3 · Expert
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About this puzzle
33 islands on a 13×13 grid need 40 bridges between them. The biggest island number is 6.
7 islands need at least one bridge to every neighbour.
Where to start
One island takes the maximum its neighbours allow, so every connection there is a double bridge.
A good first move: the island with the number 4 at row 1, column 11, which can see 2 neighbours.
At least once you will need to try a bridge in your head and see it fail one step later.