Kakuro Challenge

Kakuro are easy to learn yet highly addictive language-independent logic puzzles now following the footsteps of the worldwide Sudoku success. Requiring just pure logic and simple add/subtract calculations, these numerical-crossword puzzles (100) will carry you into a fascinating world of number combinations you never imagined could exist. The task in Kakuro puzzles is to fill all empty squares using numbers 1 to 9 so the sum of each horizontal block equals the clue on its left, and the sum of each vertical block equals the clue on its top. In addition, no number may be used in the same block more than once. There is only one unique solution for each puzzle.