Fill in the grid so that every row, every column, and every marked region contains the digits 1 through 9. The grid is joined at the outermost columns as if it were a cylindrical grid.

Fill in the grid so that every row, every column, and every marked region contains the digits 1 through 9. The grid is joined at the outermost columns and rows as if it were a toroidal grid.

Fill in the grid so that every row, every column, and cells with the same color contain the digits 1 through 9. (There aren't any boxes.)

Fill in the grid so that every row, every column, and cells with the same color contain the digits 1 through 9. (There aren't any boxes.)

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The colored extra-regions must contain each the digits 1 through 9.

Fill in the grid so that every row, every column, every 3x3 box and the cyan cells contain the digits 1 through 9.

Fill in the grid so that every row, every column, every 3x3 box, the cyan cells and both diagonals contain the digits 1 through 9.

Fill in the grid so that every row, every column, every 3x3 box, the cyan cells and both diagonals contain the digits 1 through 9.

Fill in the grid so that every row, every column, every 3x3 box, the cyan cells and both diagonals contain the digits 1 through 9.

Fill in the grid so that every row, every column, every 3x3 box and the cyan cells contain the digits 1 through 9.