Controls

You play by filling white cells with digits. Tap or click a cell to select it, then tap or click a number from 1 to 9 on the pad below the grid to fill it in.

Every run in the grid follows two rules:

• The sum clue gives the total a run must reach. The number above the diagonal in a clue cell is for the run going down, and the one below is for the run going across.
• No repeats within a run means each digit from 1 to 9 can appear only once in any of the three-cell rows or columns, which is what makes the puzzle solvable by logic alone.

Tap the eraser button on the pad to clear a selected cell if you want to change your answer.

Each puzzle is a fixed 3-by-3 grid with three across runs and three down runs, six in total, and it's solved once every run adds up correctly with no repeats.

Tips

• Start with the tightest clue. A run of three cells with a very low or very high sum, like a total near six or near twenty-four, has far fewer possible digit combinations, so solving that run first gives you certain digits to build from.
• Use the crossings. Every white cell belongs to both an across run and a down run, so a digit you place from one clue instantly limits the other, which is how the puzzle unravels.
• List the possible digits before guessing. For each run, work out which sets of three different digits from 1 to 9 can make the target sum, since narrowing the options this way beats trying numbers at random.
• Leave the hardest cell for last. The cell where a tricky across run meets a tricky down run often only has one digit that satisfies both, so let the rest of each run narrow things down before you fill it.
• Cross-check before committing a digit. Before locking in a number, make sure it fits both the across and down clues it belongs to, since a digit that works for one run may break the other.
• Never guess. Kakuro is solvable by logic, so if you're tempted to guess, there's a deduction from the sums and crossings you haven't spotted yet. Guessing usually leads to a contradiction you'll have to undo.

Frequently asked questions