Daily Killer Sudoku Puzzles

A sudoku puzzle is a 9x9 grid of cells. This grid is divided into nine rows, nine columns and nine 3x3 blocks. The object is to complete the puzzle by placing one of the values from 1 to 9 in each empty grid cells in such a way that no value is repeated in any row, column, or in any of the nine marked 3x3 blocks.

The 9x9 grid in a killer sudoku puzzle is also divided into cages which are bounded by broken lines. The values placed in the cells within a cage must add up to the stated cage sum. There is also the further restriction that no value can be repeated within a cage.

A zero killer sudoku puzzle will have cages which have no stated sum. Also, such puzzles may have grid cells which are not in any given cage.

The same value may not appear more than once along either of the main diagonals in a sudoku-x puzzle. This is also true for the four extra 3x3 blocks in a windoku puzzle which are highlighted in yellow here.

This site features both inequality sudoku puzzles and inequality killer sudoku puzzles. If there is a relation between two adjacent grid cells in an inequality sudoku puzzle then the values placed in these two cells must obey the relation. For inequality killer sudoku puzzles, relations are between cages rather than individual cells and it is the sums of the values placed in the cells of the two cages which must agree with the given relation.

Every puzzle at this site has a unique solution which can be derived logically and without guessing. There is one new puzzle for each category every day. Previously published puzzles can be found in the appropriate archive.

Individual puzzles may be reproduced without permission for any non-commercial purposes.

Please use the email address below to report any problems with this site.

Niall Paterson

Fife, United Kingdom

niall1907@hotmail.com

1st Jan 2008