Kakuro Puzzle Rules: The Complete Reference
A quick-reference page for Kakuro rules. Pin it, bookmark it, or print it out. Everything you need on one page.
This page is your quick-reference guide for Kakuro rules. Bookmark it, print it, or save it to your phone. Everything you need on one page.
The grid
A Kakuro grid has white cells and dark cells. White cells hold your answers. Dark cells are either blank (they block off sections) or they hold clue numbers. A clue number in the top-right corner of a dark cell is the sum for the white cells running to the right. A clue number in the bottom-left corner is the sum for the white cells running downward.
Rule 1: Use digits 1 through 9
Each white cell gets one digit. You can only use 1, 2, 3, 4, 5, 6, 7, 8, or 9. Zero is not allowed. Two-digit numbers are not allowed. Each cell holds exactly one digit.
Rule 2: Digits must sum to the clue
A run is a group of consecutive white cells that share a clue. The digits in a run must add up to the clue number. If the clue is 12 and the run has three cells, you need three digits that add up to 12 (like 1+3+8 or 2+4+6 or 3+4+5).
Rule 3: No repeats within a run
You cannot use the same digit twice in the same run. If a run needs digits that sum to 8 in two cells, you cannot use 4+4. You must use 1+7, 2+6, or 3+5. This rule is what makes Kakuro a logic puzzle rather than just arithmetic.
Important notes
The no-repeat rule applies within a single run, not the entire grid. You can absolutely use the same digit in different runs. Every puzzle has exactly one correct solution. You should never need to guess. If you are stuck, there is a logical deduction you have not found yet.
Notation
When solving on paper, use pencil marks (small candidate digits) in each cell to track possibilities. Cross them out as you eliminate options. When you are certain of a cell, write the digit large and clear in the center.
Ready to play?
Head to the printable page for free puzzles, browse the book catalog, or download the app. The rules are simple. The puzzles are not. That is what makes Kakuro great.