HTTPS://KAKURO-WORLD.COM/ NO FURTHER A MYSTERY

We now have a lot more puzzles where sudoku arrived from.??Just about every puzzle is made of a blank grid with sum-clues in various sites. The thing is always to fill all empty squares using numbers 1 to 9 Hence the sum of every horizontal block equals the clue on its remaining, plus the sum of every vertical block equals the clue on its leading.