SUDOKU
Slot the numbers 1 to 9 into every horizontal line, vertical row and 3 x 3 square. Here are three puzzles, graded from easy on the left, to hard on the right.
Slot the numbers 1 to 9 into every horizontal line, vertical row and 3 x 3 square. Here are three puzzles, graded from easy on the left, to hard on the right.