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:
“Logic teaches rules for presentation, not thinking.”
—Mason Cooley (b. 1927)
“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)
“However diligent she may be, however dedicated, no mother can escape the larger influences of culture, biology, fate . . . until we can actually live in a society where mothers and children genuinely matter, ours is an essentially powerless responsibility. Mothers carry out most of the work orders, but most of the rules governing our lives are shaped by outside influences.”
—Mary Kay Blakely (20th century)