It contains only puzzles of the 3 hardest levels of difficulty: BRAIN, IQ and INSANE, with addition of a few puzzles of an even more fiendish kind - Zero Killer Sudokus.
- Contents:
- 40 BRAIN (5 diagonal)
- 50 IQ! (5 diagonal)
- 10 ZERO (including 5 ZERO INSANE)
- 11 totally INSANE!
By no means is this a book for a novice Killer Sudoku solver. It is intended only for the most experienced and most persistent of those who are already masters at solving Sudokus with sums.
So... are you up for this challenge