What Is Kakuro? A Complete Beginner's Guide
A clear explanation of what Kakuro is, how it works, and why millions of people solve these number puzzles every day.
Kakuro is a number puzzle that uses a grid of white and dark cells. The dark cells hold clue numbers. The white cells are where you write your answers. Your job is to fill every white cell with a digit from 1 through 9 so that the digits in each horizontal or vertical run add up to the clue number. You cannot repeat a digit within the same run.
Think of it as a crossword puzzle, but with numbers instead of letters. Instead of word clues, you get sum targets. Instead of matching definitions, you match arithmetic. The result is a puzzle that trains both your logic skills and your mental math at the same time.
Where did Kakuro come from?
The puzzle was first published in the United States in 1966 under the name “Cross Sums” by Dell Magazines. It stayed niche for decades until Japanese puzzle publisher Nikoli picked it up in the 1980s and gave it the name “Kakuro” (short for “kasan kurosu,” which means addition cross). Nikoli made it popular in Japan, and it spread worldwide in 2005 when The Guardian newspaper started running Kakuro puzzles alongside Sudoku.
How is Kakuro different from Sudoku?
Both puzzles use digits 1 through 9 and forbid repeats in certain groups. But Sudoku gives you a fixed 9x9 grid and no math. Kakuro grids vary in size and shape, and every clue requires addition. Kakuro also tends to have more variety between puzzles because the grid layouts change. Many experienced puzzle solvers say Kakuro is harder than Sudoku at the same difficulty level because you need arithmetic on top of logic.
Who should try Kakuro?
Anyone who enjoys Sudoku, crossword puzzles, or logic games will find Kakuro satisfying. It is a good fit for adults who want a daily brain exercise, students who want to sharpen mental math, seniors who want to stay cognitively active, and kids age 8 and up who are learning addition. You do not need to be a math person. If you can add single-digit numbers, you have all the skill you need. The rest is practice.
How do I start?
Pick up an easy puzzle book, download the KakuroZen app, or print a free puzzle from our website. Start with a small grid (4x4 or 6x6). Read the rules once, then jump in. Most people learn by doing. Your first puzzle might take 10 minutes. Within a week, you will finish the same size in under three.