At the start of a new puzzle, you are give one or more squares already filled in. These may be ship segments or water. All the other squares are "unknown". To help you solve the puzzle, you are also shown the number of ship segments contained in each row and column (numbers down the right and the bottom of the grid).
|Fills a square with water.|
|Fills a square with a submarine.|
|Fills a square with the left segment of a ship.|
|Fills a square with the right segment of a ship.|
|Fills a square with the top segment of a ship.|
|Fills a square with the bottom segment of a ship.|
|Fills a square with the middle segment of a battleship or cruiser.|
|Fills a square with a yet to be determined segment of a ship. Use this when you know the square must contain a ship segment (or submarine) but you do not know which yet.|
|Fills all empty squares in a row with water. (Shortcut to entering water multiple times)|
|Fills all empty squares in a column with water.|
|Clears a square.|
A useful learning tool is the "Solve One Cell" menu option. It will fill in a cell for you and give you the reason why it needs to be that value.
The three basic strategies are:
In all explanations below, a square in row i, column j will be referred to as (i,j) - for example, row 3 column 4 will be (3,4).
|Consider the following puzzle:|
Using strategy 1, we know that all ships are surrounded by water, therefore we can fill in water for (1,3) (1,5) (2,3) (2,4) (2,5) around the submarine at (1,4).
Now, consider the left ship segment at (9,5). (9,6) must be the remainder of a destroyer because that row only contains two ship segments. So we can complete this ship and then surround it with water.
Now look at the middle segment at (5,9) where we can place a ship segment either side of it. You can see that the ship must be vertical because the column to the left of it does not contain any ship segments. So we can place a top segment at (4,9) and an unknown segment at (6,9) as we don't yet know whether this is a cruiser or a battleship. We can then fill in water at (3,8) (3,10) (4,8) (4,10) (5,8) (5,10) (6,8) (6,10) (7,8) and (7,10).
Using strategy 2, we can fill the remainder of row 9 with water as all ship segments are known. (Tip: Use the icon to do this with one click.) We can also fill in row 1, row 4, row 10, column 6 and column 8 with water because all ship segments in those rows and columns are known.
|The puzzle now looks like this:|
Now look at row 8. There are four ship segments required and only four empty spaces.
So, using strategy 3, we can fill in the cruiser and submarine in that row.
After adding water around these ships, we see that the ship segment at (6,9) must be the bottom of a cruiser, so we can convert it.
Again, using strategy 3, we can now fill in a ship segment at (2,9) completing the four ship segments required by column 9.
We can also fill water in column 1 and column 10 because all ship segments are known. This means that (2,9) can be changed to a submarine.
|The puzzle now looks like this:|
Time to introduce a new strategy. Sometimes it is useful to see where the longest ship can be placed, in this case the battleship.
If you look carefully, you will see that the only place it can fit is row 3.
After placing it, we can now fill in water at (2,2) (3,7) and can fill columns 2, 4 and 5 with water.
There are now only two spaces in column 3 for the remaining 2 ship segments so we can place a destroyer in (5,3) and (6,3). Using basic strategies, we can easily fill in the remaining two ships giving final solution below:
|This should be enough to get you going. Good luck!|