Like sudoku, kakuro is
a crossword puzzle using numbers.

The rules

Fill in the squares
using the numbers 1 to 9.

Do not repeat a
number in consecutive boxes.

The total of each
consecutive box must be equal to the number attached to that row
or column.

To help
solving these puzzles, I made a .pdf document containing all possible
combinations. It can be downloaded from here: download pdf file 1
Version 1.3

The second
document contains only the combinations with one solution
(taken from the document above). It also contains the numbers that
never occur for a given total. It can be downloaded from here: download pdf file 2

It is played on a 9x9 grid, divided into 3x3 sub grids (=regions)

Fill in each cell with a number from 1 to 9

A row contains each digit only once

A column contains each digit only once

A sub grid (region) contains each digit only once

A normal sudoku puzzle has only one solution. It can be solved by using logic only.

The supplemental killer sudoku rules:

The sum of the cells in a cage (synonym nonet) must equal the total given.

Each digit in the cage must be unique.

The 2 documents for kakuro can also be used for solving 'killer sudoku' puzzles.
These puzzles combine elements of sudoku and kakuro. The puzzles are
more difficult. Only groups with totals are given. For these puzzles the second document is more important
when starting a new puzzle because most of the time you begin with empty
cells.