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Butterfly Sudoku puzzles consist of four overlapping 9×9 Sudoku grids.

Each of the four sudoku puzzles must be solved using the standard sudoku rules.

Butterfly Sudoku Example Solution

Sudoku is played on a grid of 9 x 9 squares. Within the rows and columns are 9 boxes made up of 3 x 3 squares. Each row, column and box needs to contain the numbers 1 to 9, with no repeats.

The example below shows:

The top row containing the numbers 3, 6, 7, 4, 1, and 5. The missing numbers are 2, 8, and 9 as each row needs to contain the numbers 1 to 9, with no repeats.

The first column on the left, containing the numbers 3, 9, 4, 8, 2, 5 and 6. The missing numbers are 1, and 7 as each column needs to contain the numbers 1 to 9, with no repeats.

The top left box containing the numbers 3, 6, 7, 9, 1, 8, 4 and 2. The missing number is 5, as each box needs to contain the numbers 1 to 9, with no repeats.

Sudoku Example Solution