How does Kakuro differ from Sudoku?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

See an explanation on Zeno's Achilles paradox, an infinite series concept used in finance to pay off mortgages — number game Learn about Zeno's Achilles paradox.

While both are popular number games, Kakuro and Sudoku differ fundamentally in their mechanics and requirements.

Sudoku is based entirely on logic and does not involve any arithmetic. The objective is to fill a 9×9 grid so that each row, column, and 3×3 subgrid contains the numbers 1–9 exactly once.1

In contrast, Kakuro puzzles—often referred to as "cross-sums"—require arithmetic. In Kakuro, the numbers placed in the grid must add up to specific totals provided in the puzzle clues. While Sudoku relies on the placement of digits based on their uniqueness within a set, Kakuro functions more like a crossword puzzle where the "answers" are numerical combinations that satisfy the sum requirements for each row and column.1