Rules
The objective is to fill the grid with numbers from 1 to 9 in a way that the following conditions are met:
- Each row, column, and nonet contains each number exactly once.
- The sum of all numbers in a cage must match the small number printed in its corner.
- No number appears more than once in a cage. (This is the standard rule for killer sudokus, and implies that no cage can include more than 9 cells.)
In 'Killer X', an additional rule is that each of the long diagonals contains each number once.
Read more about this topic: Killer Sudoku
Famous quotes containing the word rules:
“You’d leave your own mother here, if the rules called for it.”
—Michael Wilson (1914–1978)
“It was one of the rules which above all others made Doctr. Franklin the most amiable man in society, “never to contradict any body.””
—Thomas Jefferson (1743–1826)
“There are different rules for reading, for thinking, and for talking. Writing blends all three of them.”
—Mason Cooley (b. 1927)