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Fill in the grids so that every row, every column and 3x3 box contains the digits 1 through 9. There must be a one-to-one correspondence between both twins, i. e., in all positions with a certain digit in the first grid must be in the corresponding position in the second grid also always the same digit (possibly another as in the first grid). Numbers going along grey lines must be in increasing or decreasing order from one end to the other.

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 will have exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point.

In each 3x3 box their is a different rule to follow:

• Upper left - Even/Odd Sudoku: Yellow cells must contain odd digits, green cells must contain even digits.
• Upper centre - Min Max Quad Sudoku: The red points in the near of crosses where four cells meet each other show that the cell with the red points is greater then the three other ones. The blue rings in the near of crosses where four cells meet each other show that the cell with the blue ring is smaller then the three other ones.
• Upper right - Arrow Sudoku: The digit in the circle is the sum of the digits which are marked with its arrow.
• Centre left - Difference Sudoku: The numbers between two cells give the difference of the digits.
• Centre - Navigator Sudoku: The arrows show the location of the same number in the previous or next column or row. So for example, the arrow in fifth column means that the same digit is in the sixth column in row 6 - 9.
• Centre right - Greater/Less Sudoku: The inequality between each pair of digits must stand correct.
  

Füllen Sie das Diagramm mit Zahlen von 1 bis 9, wobei in jeder Zeile, jeder Spalte und in jedem der neun 3x3-Felder jede Zahl genau einmal vorkommt. Die Zahlen auf den grauen Linien müssen in aufsteigender oder absteigender Reihenfolge geordnet sein.