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. You fill a grid of empty cells with digits 1 through 9. Each run of cells must add up to a small clue number. You cannot repeat a digit inside the same run. That is the whole game.
People call Kakuro the math crossword. The grid looks like a crossword. But the clues are sums, not word hints. You add. You think. You fill in cells. Then you check.
Where Kakuro came from
The puzzle was born in 1966 in the United States. Dell Magazines called it Cross Sums. It stayed small for years. Then a Japanese puzzle company named Nikoli picked it up in the 1980s. They gave it the name Kakuro.
Kakuro is short for “kasan kurosu.” That means addition cross in Japanese. Nikoli made it big in Japan. The puzzle spread worldwide in 2005 when The Guardian newspaper started printing it next to Sudoku.
Kakuro vs Sudoku: what makes them different
Both puzzles use digits 1 to 9. Both forbid repeats. But the rest is not the same. Sudoku gives you a fixed 9 by 9 grid. Kakuro grids change shape. Some are 4 by 4. Some are 12 by 16. Each grid feels new.
Sudoku has no math. You just place digits. Kakuro asks you to add all the time. Many Sudoku fans say Kakuro is harder at the same level. The math makes it more work.
Who should try Kakuro
You will like Kakuro if you enjoy Sudoku, crosswords, or logic games. It fits adults who want a daily brain workout. It fits kids age 8 and up who are learning to add. It fits seniors who want to stay sharp.
You do not need to be a math whiz. If you can add single digits, you can solve Kakuro. The rest is practice.
How to start your first kakuro puzzle
Pick an easy book. Or open the KakuroZen app. Or print a free puzzle from our site. Start small. A 4 by 4 grid is fine. Read the rules once. Then jump in.
Your first puzzle might take 10 minutes. Within a week, the same size will take three. That is normal. Speed comes fast.