- Unlike in regular Nurikabe, the clue numbers have been placed outside the grid.
- A clue will appear in the first unshaded cell in its row/column, counting from the clue’s direction.
- Standard Nurikabe rules then apply:
- Shade some cells to form a continuous wall that contains no 2×2 squares of shaded cells.
- The clue numbers hint at connected groups of unshaded cells.
- Every group has exactly one clue, which tells the group’s size.