Kakuro

How to play Kakuro

Kakuro is a crossword made of numbers. Fill every white square with a digit from 1 to 9. Each black square with a number is a clue: the number above its diagonal line is the total of the white squares to its right, and the number below the line is the total of the white squares beneath it.

• A run is a line of white squares, across or down, between black squares. Its digits must add up to its clue.
• No digit can appear twice in the same run. So a run of two that adds up to 4 must be 1 and 3, never 2 and 2.
• Tap a white square, then a digit. You can also type the digit.
• The line under the grid shows both runs through the square you've chosen. When only a few sets of digits can make a total, it lists them.
• A digit repeated in a run, or a full run with the wrong total, turns red.
• Every puzzle has exactly one solution, checked by a solver before it goes on the site.

Choose a size above the grid: Easy, Medium or Hard. Notes lets you pencil in the digits a square might be. Check marks wrong squares with a dashed outline, and Hint fills in the square you've chosen. Undo and Redo have no limit.

Tips

• Learn the totals that can only be made one way. Two squares adding to 3 must be 1 and 2, and to 17 must be 8 and 9. Three squares adding to 6 must be 1, 2 and 3, and to 24 must be 7, 8 and 9.
• Where an across run and a down run share a square, that digit must fit both. Often only one digit does.
• Use notes for the squares you're not sure of, then cross digits off as the runs around them fill in.

Keyboard

Arrow keys move between white squares, skipping the black ones. Type a digit to fill a square, or hold Shift to add it as a note. N turns notes on and off, Delete clears a square, Ctrl+Z undoes and Ctrl+Y redoes.