Hard Kakuro
Hard Kakuro puzzles are 9×9 and need you to try the fillings of a run: when no arrangement of different digits puts a digit in a cell, that digit is out.
Hard puzzles need at least one of these techniques, and may use any easier one:
- Try the fillings
- No way of filling this run with different digits that adds up to its clue puts these digits in these cells.
How to play
Kakuro is a number crossword. Black cells hold clues: the number below a cell's diagonal is the sum of the white run beneath it, the number above is the sum of the run to its right. Fill every white cell with a digit from 1 to 9 so each run adds up to its clue and no digit repeats within a run.
Every Kakuro here has exactly one solution and can be solved by logic alone. Its level is the hardest technique it needs, and the grid grows from 6×6 at Easy to 10×10 at Expert.
- Fill each white cell with a digit from 1 to 9.
- The digits of a run add up to the clue at its start: down sums below the diagonal, across sums above it.
- No digit repeats within a run.
Playing on this site
- Select a cell, then type a digit or tap it on the number pad. Arrow keys move the selection.
- Turn on Notes (or press N) to pencil in candidates instead of answers.
- Hint first points out any wrong digits, then names the next technique and shows where it applies before giving anything away.
- Your puzzle is saved in this browser, so you can come back to it later.