Killer Sudoku: 150 Easy to Hard Challenging Sudoku Puzzles with Solutions (Paperback) (ISBN-13: 9798487342447)

Fill numbers 1-9 in the empty spaces of the grid such that these numbers appear exactly once in each row, column, and 3×3 square. The sub-regions in the Killer Sudoku grid (indicated by dotted lines) have specified sums. These sum clues have to be satisfied to complete the puzzle.

• Suitable for ages 12 and up.
• One puzzle per page; 150 puzzles in total.
• Easy to hard puzzles for both novices and experts.
• Solutions included.
• Guaranteed hours of fun.
• Travel companion paperback.

Other Sudoku puzzle variants are also available. Are you up for the challenge?