Tap a square then a digit (or type it, arrow keys to move). The helper crosses out impossible combinations and highlights the digits still possible on the keypad.
How to play Kakuro
Each black square holds one or two sums: the top-right one is for the white block to its right, the bottom-left one for the block below. Fill the squares with digits from 1 to 9 to reach these sums, never repeating a digit in the same block. Tip: some sums have only one combination (3 in 2 squares = 1 + 2, 17 in 2 squares = 8 + 9).
- Easy: 4 × 4 grids.
- Medium: 6 × 6 grids.
- Hard: 8 × 8 grids.
- Expert: 9 × 9 grids.
