Kakuro is like Suduko on steroids. Often called "Cross-sums" in the States, Kakuro is quickly surpassing Sudoku in popularity.

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Kakuro
 



  1. Enter a series of single digit numbers that add up to the numbers found in the adjacent blocks. (ex. adjacent block reads "12," numbers used in a triple block solution could be 1+6+5, 2+4+6, 8+1+3, ...)
  2. Use only numbers 1-9.
  3. Numbers can only be used once in each row or column.
  4. Numbers can be listed in any order as long as the cross-numbers add up to the target sum.