Fill in the grid so that every row, every column, every 4 x 4 box, the green, the orange and the blue fields contain the digits 1 through 9.
Fill in the grid so that every row, every column, every 4 x 4 box, the green, the orange and the blue fields contain the digits 1 through 9.
Fill in the grid so that every row, every column, every 4 x 4 box, the green, the orange and the blue fields contain the digits 1 through 9.
Fill in the grid so that every row, every column of the 7x7 grid completed with both adjacent border fields contain the digits 1 through 9.