That Cage’s clue is 9, which means the other Cell must be a 7.
Now, look at the Cage where we just added our 2. Pretty clever right? This simple technique is used a lot when solving Killer Sudoku puzzles. That means the remaining square must equal 2, because all completed regions must add up to 45. So, if we look at the Nonet on the lower left, we know that the value of the Cells in the complete Cages will equal 18 + 16 + 9 (43 in total). The rule of 45 states that the Cells in each Row, Cell, or Nonet must add up to 45. What is the significance of this? It means we can apply the rule of 45 to determine the value of the standalone Cell. It also holds a single cell which is half of a Cage of 9. Notice that it holds 3 complete Cages, which have clues of 16, 18, and 9. For example, look at the Nonet on the lower left of the puzzle (marked in black). It is a very handy rule that will help you solve many puzzles. That’s because we can apply the Rule of 45 to discover what that spare cell contains. An easy way to find a starting point is by looking for a Region that contains multiple Cages and a single spare Cell. One of the greatest challenges faced by first-time players is deciding where to start. Let’s take another look at our puzzle and see if we can begin solving it. The sum of the numbers inside of a cage must equal the clue numberĪ Cage with two Cells and a clue of 3 must contain the numbers 2 and 1. You couldn’t have two 4’s appearing in the same row, column, or nonet. Each row, column, and nonet can only contain unique numbers. You can’t attempt to squeeze a 1 and 2 into a single cell to complete the puzzle.Ģ. However, the following restrictions apply:ġ. The image below has examples of these components marked out.Īs mentioned earlier, the goal of Killer Sudoku is to fill the cells with the numbers 1 to 9. This is sometimes used as a quick way of identifying a Column, Row, or Nonet. So, the values in the cells could be a 1 and 4 or a 2 and 3.Ĭages are a unique feature of Killer Sudoku puzzles and do not appear in Sudoku or Kakuro puzzles.Ī house is any non-repeating set of 9 cells. This tells us that the total value of the numbers in those two squares adds up to 5. If we look at the top left corner of the puzzle above, you will see a yellow Cage cover 2 cells has the number 5 in it. Each Cage will have a number in it, which represents the total value of the numbers in the Cage’s Squares. The Cage is the colored sections of the puzzle.
There are 9 of them in each puzzle, outlined by a thicker line (shown below). This is a 3 x 3 grid of cells that sits within the puzzle. The numbers 1 to 9 can only appear once per column. The numbers 1 to 9 can only appear once per row.Ī column is a vertical line of 9 cells. The names of the main components of the puzzle are:Ī cell is one of small squares inside of the puzzle, into which you place a single numberĪ row is a horizontal line of 9 cells. Let’s start by taking a look at a Killer Sudoku puzzle and identifying its different components.
#Killer sudoku rules how to
In this comprehensive guide you will learn how to play the popular game of Killer Sudoku. However, the most difficult Killer Sudoku puzzles can take many hours to solve.
It is a high-entertaining, fun, and interesting game that will give you many hours of enjoyment.ĭespite the name, many Killer Sudoku puzzles are easier than standard Sudoku puzzles, particularly if you have good mental arithmetic skills. To solve a Killer Sudoku puzzle, players must use clue numbers and a set of basic rules which are similar to standard Sudoku rules. Combining elements of Sudoku and Kakuro, it is a written number game that is played on a 9 x 9 grid, with the simple objective of filling all of the puzzle’s cells with the numbers 1 to 9. Killer Sudoku is an extremely addictive logic puzzle.
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