NUMBER PLACE
EXAMPLE A. Print page, fill empty blocks and hand in.

      4 5       9
                 
      1       5  
    4   6        
  6     9     3  
          4      
            9    
    8           5
9                

What rule would you add to the list below?

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Not copyrighted rule list: The natural numbers: 1, 2, 3, 4, 5, 6, 7, 8 and 9 must be in all columns and in all rows in some order. If you look at the 81 rectangles as 9 large rectangles, three on each side and one in the middle, each with nine small rectangles then 1 through 9 must be in each large rectangle.