Including addictive variations of the Sudoku original, this title offers a challenge for every Sudoku fan with 140 original puzzles. The puzzles range from easy to brain-melting. The ultimate Soduku challenge with 140 killer Sudoku and Samurai Sudoku puzzles, which are variations on the original that will challenge every puzzler. With Killer Sudoku, you have the same 9X9 grid but with an added challenge: the aim is not only to complete every row, column and cube so that it contains the digits 1-9, but you have to make sure that the smaller outlined cubes (with dotted lines within the Sudoku grid) add up to the same number. If that's not enough, we have a range of Samurai Sudoku puzzles: the puzzle is essentially the same as the original but 5 Sodukus are linked via the centre one, which will provide even the experienced Sudoku addict with a good challenge. This fiendish puzzle now appears regularly in the "Times" newspaper.