Forced Bridge
Even maxing out every other connection would leave this island short — so this connection must carry the difference.
How it works
- 1The 3 in the top-left corner has to spread 3 bridges across just two directions.
- 2If either direction carried nothing, the other would have to supply all 3 — and a connection tops out at 2, one short.
- 3So each direction must carry at least one bridge. The same logic applies to a 5 on an edge or a 7 anywhere.
- Bridge to add
- Islands that establish the pattern