Killer sudoku / sum sudoku puzzles are similar to sudoku. No number is revealed explicitley.
The sum of numbers in a sudoku puzzle is given as clue(see the small numbers and dotted areas in the sample below)
See also our Puzzle Books.
(see solutions here )
Also check out our Shareware game Sudoku SoftBook , where you can play more than 50,000 Sudoku , Killer Sudoku & Comparision Sudoku Puzzles.
Download Killer-Sudoku Free game,( 1.4 MB) Windows Computer Games
We offer Killer sudoku puzzles, free for publications. see our puzzle syndication and contact me