Rectangle Outline Sudoku
Each of the main diagonals of this sudoku must contain the numbers
1 to 9 and each rectangle width the numbers 1 to 4.
Age
11 to 16
Challenge level
Invented by Henry Kwok
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Rules of Rectangle Outline Sudoku
This Sudoku variant has two additional rules.
As usual, the object of the puzzle is to fill in the whole 9x9 grid with numbers 1 through 9 so that each row, each column and each box must contain all the nine different numbers 1 to 9 irrespective of order.
The two additional rules of the variant are as follows:
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Each of the two main diagonals of the puzzle must have the numbers 1 to 9.
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Within the 9x9 pattern there is a highlighted "rectangle" with its width four and length six cells respectively. Each width of the "rectangle" outline must contain all the four numbers 1 to 4. Similarly, each length of the "rectangle" must contain all the six numbers 1 to 6.
Samuel from Durrington High School and Rukhsh from Jumeirah Primary School both sent us the correct solution:
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