Normal Sudoku rules apply. The circles shown in the grid are the centres of point-symmetrical “galaxies”. Each galaxy forms a line with one-cell width that must contain at least 3 cells. Each line cannot touch itself and does not form any loop. Galaxies cannot overlap. The number next to a circle shows the sum of the numbers between the smallest and the largest number of the galaxy line. Numbers cannot be repeated along galaxy lines. Not every cell in the grid has to be part of a galaxy.