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Fill in the grid so that in every row and every column as well of the yellow as of the green square contains the digits 1 through 6. Additionally every marked region contains the digits 1 through 6.

Fill in the grid so that in every row and every column as well of the yellow as of the green square contains the digits 1 through 5. Additionally every marked region contains the digits 1 through 5.

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and cells of the same color has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point.

Fill in the grid so that every row, every column, and every outlined region contains the digits 1 through 9.

Fill in the grid so that every row, every column, and every outlined region contains the digits 1 through 9.

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 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.)