Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. There are no neighbouring cells with consecutive digits.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. There are no neighbouring cells with consecutive digits.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. There are no neighbouring cells with consecutive digits.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. All neighbouring cells with consecutive digits have a colored border between.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. All neighbouring cells with consecutive digits have a colored border between.

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The digit in a circle is the sum of the digits which are marked with its arrow.

Fill in the grid so that every row, every column, and every 2 x 3 box contains the digits 1 through 6. The digit in a circle is the sum of the digits which are marked with its arrow.

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box will have exactly one of each digit. In green cells can only be even digits. In white cells both odd and even digits are possible.

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box will have exactly one of each digit. In yellow cells can only be odd digits. In white cells both odd and even digits are possible.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Yellow cells must contain odd digits, green cells must contain even digits.