In each row and column the digits 1-9 must appear exactly once. Each cell is part of a “galaxy”. There are big galaxies of exactly 9 cells and island galaxies which are smaller than 9 cells. Digits can't repeat in galaxies. Each galaxy is 180 degrees rotational symmetric. In the centre of each galaxy there is exactly one circle either between 2 cells or in a cell. A circle in a cell is odd and a circle between 2 cells is a consecutive pair. Some of the circles are given, the other circles must be deduced (but all circles must have the circle properties listed above). Island galaxies can't touch each other, not even diagonally. Clues outside the grid sum the digits of the island galaxies in that row or column.