Djape was one of the first authors of Killer Sudoku puzzles out there. Started in September 2005 and publishing daily killer sudokus ever since. Only top quality puzzles, not for the fainthearted, as Djape tends to make them more fiendish than other authors. Killer Sudoku books are also available, as well as numerous variants of this addictive Sudoku game, also known as Addoku, Sumdoku or Sudoku sums.