Ken-Ken
A bite-sized arithmetic logic puzzle. Fill the grid so every row and column holds each digit once, and each cage hits its target.
What is KenKen?
KenKen is a grid-based logic puzzle. Fill an N×N grid with the digits 1 to N so that no digit repeats in any row or column. The grid is split into outlined groups called cages — each shows a target and an operation, and the digits in the cage must combine, using that operation, to produce the target.
How to play
- 1
Fill rows and columns
Place the digits 1 to N so each appears exactly once in every row and every column.
- 2
Satisfy each cage
An outlined cage shows a target and an operation. The digits inside must combine, using that operation, to make the target.
- 3
Use notes and checks
Jot candidate digits as notes, toggle rule-checking to spot duplicates, and reveal mistakes if you get stuck.
Operations
Addition
Cage digits add up to the target (any cage size).
Subtraction
Two cells; the target is their absolute difference.
Multiplication
Cage digits multiply to the target (any cage size).
Division
Two cells; the larger divided by the smaller equals the target (whole numbers only).
Difficulty levels
Easy
3×3, 4×4, 5×5 · + − × (÷ on 3×3)
Gentle grids to learn the ropes.
Intermediate
4×4, 5×5 · + − × ÷
All four operations in play — the daily puzzle's tier.
Hard
6×6, 7×7 · + − × ÷
Bigger boards and tighter cages.
Genius
8×8, 9×9 · + − × ÷
A serious workout for puzzle veterans.