Daily Killer Sudoku Puzzles...

A sudoku puzzle is a grid with nine rows, nine columns and nine 3x3 blocks. Complete the puzzle by placing the values from 1 to 9 into the empty grid cells, such that no value is repeated in any row, column, or in any of the nine blocks.

The grid in a killer sudoku puzzle is also divided into cages bounded by broken lines. The values placed within a cage must add up to the cage sum. Once again, no value can be repeated within a cage.

Zero Killer Sudoku Puzzles...

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

Sudoku-X Puzzles...

Values may not be repeated along either of the main diagonals in a sudoku-x puzzle.

Windoku Puzzles...

There are four extra 3x3 blocks in a windoku puzzle which are highlighted in yellow here. Values may not be repeated inside these blocks.

Inequality Sudoku Puzzles...

If a sudoku puzzle has a relation between two adjacent grid cells then the values placed in these cells must obey the relation.

Inequality Killer Sudoku Puzzles...

For inequality killer sudoku puzzles, relations are between cages, not the values in the cells. If there is a relation between two cages then it is the cage sums which must agree with the relation.

No guessing...

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 archives.

Solver Programs...

There is a solver program for the sudoku puzzles and another program for the killer sudoku puzzles.

Any Problems...

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

Niall Paterson

Fife, United Kingdom

niall1907@hotmail.com

1st Jan 2008