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:
“Although none of the rules for becoming more alive is valid, it is healthy to keep on formulating them.”
—Susan Sontag (b. 1933)
“The great challenge which faces us is to assure that, in our society of big-ness, we do not strangle the voice of creativity, that the rules of the game do not come to overshadow its purpose, that the grand orchestration of society leaves ample room for the man who marches to the music of another drummer.”
—Hubert H. Humphrey (1911–1978)
“For rhetoric, he could not ope
His mouth, but out there flew a trope;
And when he happen’d to break off
I’ th’ middle of his speech, or cough,
H’ had hard words ready to show why,
And tell what rules he did it by;”
—Samuel Butler (1612–1680)