DWG-106.1.09
Bridges #9 · Easy
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About this puzzle
9 islands on a 7×7 grid need 13 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 2, column 5, which can see 3 neighbours.
Island arithmetic is enough here: compare each number with the neighbours it can see.