GridWits
Medium tier Technique 8 of 18 Used by Smart Hint

Between Two Islands

A cell touching two different islands can't belong to either one — it's sea.

How it works

  1. 1Two different islands have grown close enough that one cell now touches both of them.
  2. 2That cell can't join either island without connecting them — it must be sea. This is the general form of Diagonal Clues: it applies to any two islands' current shapes, not just their starting clue positions.
3 3
  • Island (land)
  • Sea
  • Cells that establish the pattern
  • Where the conclusion lands
Next in the ladder Landlocked Cell →

A cell fully surrounded by land can't be a lone patch of sea with nowhere to connect — it's land.