Fill the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. If the difference between two cells is 1 then there is a white dot. If digit in a cell is the half from a neighboring cell then there is a black dot. The dot between two cells with 1 and 2 can have any of these two colors.

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. If the difference between two cells is 1 then there is a white dot. If digit in a cell is the half from a neighboring cell then there is a black dot. The dot between two cells with 1 and 2 can have any of these two colors.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Equal digits can be neither orthogonally nor diagonally adjazent.

Fill in the grid the numbers 1 through 9 so that in every row, every column (even if it is not continous) and in cells of the same color no number is repeated. There are no neighbouring cells with consecutive numbers.