The black cells form "the nurikabe" Islands in the Stream calls it "the stream" : they must all be orthogonally contiguous form a single polyomino , number-free, and contain no 2x2 or larger solid rectangles Islands in the Stream calls such illegal blocks "pools". The white cells form "islands" which is where Islands in the Stream got its name : each number n must be part of an n-omino composed only of white cells.
All white cells must belong to exactly one island; islands must have exactly one numbered cell. Solvers will typically shade in cells they have deduced to be black and dot non-numbered cells deduced to be white.
Left click on a square to make it black. Right click to mark with dot. Click and drag to mark more than one square. Feedback Specific puzzle FAQ. Mass Print Hall of Fame Statistics. Go to the old version. What am I supposed to do? Video Tutorial. Nurikabe is a logic puzzle with a bit complicated rules and challenging solutions. Video Tutorial Hide the rules.
Show the rules. Tweets by PuzzleTeamClub. The '2' clue must expand in to cells 'D' or 'E', which means that cell 'F' must be black. One of the Nurikabe rules is that we can't have a 2x2 block of black cells. If cell 'G' was black, then this is exactly what we would have, therefore cell 'G' must be white.
We will now look in more detail at the '6' clue at the bottom of this puzzle. We already have 4 white walls for this clue, so we need another 2.
This wall can't expand in to cells 'C', 'D' or 'E' - two walls aren't allowed to touch diagonally is ok. Expanding in to any of these cells would give us two touching white walls. This means that our '6' clue can only expand in to cells 'A' and 'B'. We need another 2 cells, and this is our only option. This will leave us with our required number of white wall cells for the '6' clue, so we can surround this block with black cells, i.
There is now a range of cells we can look at, If cell 'A' was white, then that would cut off the set of black cells to it's right, i. Cell 'B' must be black to stop the cell under it being isolated. There are two options for the '4' clue next to 'C', 'D' and 'E'. It can either expand in to 'C' and 'D', or it can expand in to 'D' and 'E'. Either option has cell 'D' as a white wall, so we can fill that in white.
There is now another range of cells we can look at, The '2' clue at the bottom must expand in to cell 'A' - that wall has nowhere else to expand in to. This means that cell 'B' must be black. This means that the '2' clue in the bottom-left corner must expand downwards in to cell 'C'. The '2' clue next to cell 'D' must expand upwards, or to the left.
Either possibility means that cell 'D' must be black. This is the same technique we used a few moves above. Cell 'E' must be white to stop us having a 2x2 block of black cells.
This means that the '4' clue now has all of it's white wall cells. This means that cell 'F' must be black. We can now look at this range of cells, Cell 'A' must be black to stop the cell underneath being isolated. The '3' clue must expand upwards in to cell 'B', i. We can also look at cells 'D', 'E', and 'F' in the top-left. We know that at least one of these cells must be white to stop us having a 2x2 block of black cells. The only way this can be achieved is if the '5' clue expands upwards in to cells 'C' and 'D'.
It might expand in to cells 'E' and 'F' as well, but for the time being we can only fill cells 'C' and 'D' in white. We can now look at the '5' clue in the middle-left of this puzzle. There is actually only one possibility for this clue now - it can only expand in cells 'A', 'B', 'C' and 'D'.
All other possibilities would mean that this wall would merge with another wall section. We can also fill in cells 'E', 'F', 'G' and 'H' in black to surround this white wall with black cells. We can now look at this range of cells, The '2' clue must expand upwards in to cell 'A'. This means that cell 'B' must be black to surround the 2 white cells.
Cell 'C' must be black to stop the black cells below being isolated from the rest of the black cells. We can now look at this list of cells, Cell 'A' must be black to stop the large section of black cells below it being isolated from the rest of the puzzle.
This means that the '3' clue can only expand in to cells 'B' and 'C', i. We shall now look at the labelled cells, Cell 'A' must be black to stop the set of three cells below being isolated from the rest of the grid. This means the '5' clue can only expand in to cells 'B' and 'C', i. We can now finish this Nurikabe puzzle, Cell 'A' must be black to stop the large set of black cells below being isolated from the rest of the puzzle. This means that '2' clue must expand upwards in to cell 'B' The '2' clue now has it's full set of white cells, so cell 'C' must be black.
Finally, the '3' clue can only expand to the right in to cell 'D'. Try our other puzzles! Jigsaw Sudoku. Samurai Sudoku. Kids Sudoku. Hyper Sudoku.
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