Killer Sudoku is a very popular variant of classic Sudoku that adds some new challenges.
If you find them too small.
The Puzzles are arranged 4-per-page.
Each puzzle has a single, uniquesolution.
Once you try them, you\'ll find it very hard to go back to boring plain old Sudoku This book has 360 puzzles, in order of difficulty ranging from Tough to Insane, using the same grading system as my puzzle website, Krazydad.com.
These Puzzles have more going on and can be extremely satisfying to solve.
Killer Sudoku is a very popular variant of classic Sudoku that adds some new challenges