You are given a 8x8 board (representing the ocean) with some hidden ships on it. The ships are one unit wide and 2, 3, 4, 5 or 6 units long. They are positioned either horizontally or vertically. The number of these ships is indicated at the right border. Their position is unknown , but you know that they do not touch each other, not even diagonally.
The number at the border show how the 'material thickness' like in an X-ray2 machine, i.e. they show how many positions are used in a file or row.

You place your ships by clicking its top (left), then its bottom (right) positions.
After your move the current number of your pieces in each file and row are calculated and displayed at the lower and right border. Sums which differ from the target sums are written in red.
You win when all numbers are in blue colour.
(Several ship setups may create the same X-ray sums at the border).

You can DELETE A SHIP you have created at any time simply by clicking it.
To see the SOLUTION click one of the four corner positions.

Variant 2: plays on a 10x10 board.
Variant 3: plays on a 12x12 board.
Variants 4 to 6: like variants 1 to 3, but the number of ships is not displayed.

Please note that there is an alternative piece set available.