Wall continuity

The "Wall continuity" technique is a vital method in solving Nurikabe puzzles at an intermediate and advanced level. It builds on the basic rule that all walls in the puzzle must form a single connected group.

This strategy involves extending walls in a manner that ensures their continuity. If you identify an area where the wall needs to pass to maintain its connectivity, you can mark those squares as wall squares.

Here's an example of the Wall continuity technique in action:

Using the "Wall continuity" technique, you can deduce and mark many squares as part of the wall, helping you make considerable progress in the puzzle. Keep in mind, the method requires careful observation and a clear understanding of the puzzle's layout.