DWG-106.1.05
Bridges #5 · Easy
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About this puzzle
8 islands on a 7×7 grid need 12 bridges between them. The biggest island number is 5.
4 islands need at least one bridge to every neighbour.
Where to start
2 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 4, column 4, which can see 2 neighbours.
Island arithmetic is enough here: compare each number with the neighbours it can see.