Wall expansion
The "Wall expansion" technique is an advanced strategy used in Nurikabe puzzles. This technique is based on the rule that all walls must form a single continuous path.
Thus, when you see a single-square wall that is isolated from the rest of the walls, you must expand it so that it connects with the other walls. The direction of the expansion depends on the available space and the positions of nearby islands.
Here is an example of how this technique works:
.png&w=3840&q=75 "Wall expansion")
.png&w=3840&q=75 "Wall expansion")
The "Wall expansion" technique can be particularly helpful in advanced stages of solving a Nurikabe puzzle. It ensures the wall's continuity and contributes to the completion of the puzzle by effectively integrating isolated wall segments.