How do you play kakuro?

Answer 1

There are three simple and basic rules to kakuro:

1. Each entry must equal the sum of the number clue to its left (for across) or directly above it (for down).

2. You may use only the numbers 1 through 9.

3. Within an entry, you may not use a number more than once. Unlike Sudoku however, a number may be repeated within a row or column if it occurs in a different entry separated by a clue or a blank.

That is basically it.