What is a killer sudoku?

Like many puzzles, people are always trying to make them harder and more difficult to do. Whenever you see the word, “killer” in front of a puzzle, you should know that it is very difficult. For instance, you may see the words “killer crosswords,” that means that the crossword puzzles are very difficult. Killer sudokus are the same thing. These sudokus were made to take hours to figure out.

However, the easy version of the killer sudokus have actually been easier than the regular sudokus. Therefore, you may have to try them out because some killer sudokus are easier than others. There is a difference between the killer sudoku and a regular sudoku puzzle that is because the killer sudoku is a combination of kakuro and sudoku.