Kakuro

Kakuro is a number puzzle often described as a mathematical crossword. The grid contains empty cells that must be filled with digits 1 through 9. Clue cells display target sums — the numbers you place in each consecutive run of cells must add up to the clue, and no digit can repeat within a single run. Kakuro combines the logic of Sudoku with basic arithmetic for a uniquely satisfying puzzle experience.

1. Click on an empty white cell to select it.
2. Enter a digit (1-9) using the number pad or your keyboard.
3. Numbers in each horizontal or vertical run must add up to the clue shown.
4. No digit can be repeated within a single run.
5. Use the Delete button or Backspace to clear a cell.
6. Complete all cells correctly to solve the puzzle.

• Only digits 1 through 9 are used — no zeros.
• Each horizontal run of cells must sum to the clue on its left (shown with → arrow).
• Each vertical run of cells must sum to the clue above it (shown with ↓ arrow).
• No digit may repeat within a single run (horizontal or vertical).
• Clue cells with both arrows have separate sums for across and down.

• Start with runs that have very few possible combinations (e.g., a 2-cell run summing to 3 can only be 1+2).
• Look for intersections where across and down constraints narrow possibilities.
• Learn common Kakuro combinations: 3 in 2 cells = {1,2}; 4 in 2 cells = {1,3}; 16 in 2 cells = {7,9}.
• Use elimination: if a run's sum and length leave only certain digit combinations, rule out impossibilities.
• Cross-reference: a cell shared by two runs must satisfy both sum constraints.

• Easy (Small Grid): Fewer cells and simpler sums for beginners.
• Medium: Standard-size grid with moderate difficulty.
• Hard (Large Grid): Complex grids with many intersecting constraints.

• Kakuro offers a unique puzzle experience that's different from Sudoku.
• The arithmetic element adds a layer of satisfaction — you're solving mini math puzzles at every intersection.
• The logical chain reactions that flow from a single deduction are deeply rewarding.

Play Kakuro free in your browser with our interactive grid. Click cells, enter numbers, and solve the puzzle. No downloads or accounts required. Great for fans of Sudoku looking for a fresh number challenge.

Kakuro is the perfect puzzle for anyone who loves numbers and logic. Fill the grid, match the sums, and experience the satisfaction of mathematical deduction. Give it a try today.