Oliver’s Sudoku Quilt by Julia Cockell – Nine squares in nine squares on a sudoku basis – each pattern appears only once in each horizontal and vertical line.

Oliver's Sudoku Quilt by Julia Cockell - Nine squares in nine squares on a sudoku basis - each pattern appears only once in each horizontal and vertical line.

Oliver’s Sudoku Quilt by Julia Cockell – Nine squares in nine squares on a sudoku basis – each pattern appears only once in each horizontal and vertical line.