KenKen
| Min number of participants | 1 |
| Age | 8+ yrs. |
| Safety support by adult | Not required |
| Min duration | 15 min. |
| Cost | Low |
| Environment | Indoor / Outdoor |
A grid puzzle that combines Sudoku's no-repeat rows and columns with bold-outlined "cages" of cells that must combine, using addition, subtraction, multiplication, or division, to a printed target number.