1. In the black squares around the
edges of the blocks are numbers, called clues. These clues tell you the sum of the numbers in that block. In other words, if the clue is a 9, the correct answers to the individual squares in that block will add up to 9. Across clues are represented by the numbers printed on the black squares above the diagonal line and down clues are those below the line.
2. You cannot repeat any number in a given block.


