Killer Sudoku - Sudoku Puzzles - Sudoku puzzles challenge

Keep your brain sharp with Killer Sudoku, a new 2020 brain training puzzle game from Beetle Game Studio.

Killer Sudoku is a logical reasoning number puzzle that blends elements of sudoku, kenken, and kakuro. Despite its name, simpler killer sudoku puzzles can be easier to solve than classic sudoku, depending on the solver's skill in mental arithmetic; however, the most challenging ones can take hours to complete. Our Sudoku puzzles app allows you to enjoy killer sudoku games anytime, anywhere, while also learning Sudoku techniques.

How to play:

✓ Each Sudoku puzzle has only one correct solution.

✓ Place numbers 1 to 9 into each grid cell

✓ Every cell is part of a cage, indicated by dotted lines.

✓ The sum of all numbers in each cage must equal the value in the upper left corner

✓ Numbers cannot be repeated in any cage, row, column, or 3x3 region

Killer Sudoku Rules

Summary

The rules for Killer Sudoku are simple. The rules for regular sudoku apply, with one additional rule: The sum of the cells in a cage must equal the total given for the cage. Each digit in the cage must be unique.

Terminology

Cell

A single box. It can contain any digit from one to nine.

Row

A horizontal group of nine cells. Each cell in the row must contain a different digit.

Column

A vertical group of nine cells. Each cell in the column must contain a different digit.

Nonet

A 3x3 grid of cells. It is surrounded by bold lines. Each cell in the nonent must contain a different digit.

Cage

A group of cells surrounded by a dashed line. The values of the cells in a cage must sum up to the total specified in the upper right of the cage.

The values in a cage must be unique even if the rules of regular sudoku would allow for duplicates. For example, the cells labeled 'a' and 'b' in the figure cannot have the same value.

Region

An area of the puzzle that cannot contain duplicate digits. That is, a row, a column, a nonet, or a cage.

Basic Solving Strategies

The following are the basic rules used to solve killer sudokus.

Rule of 1 This comes directly from the definition of sudoku. No region can contain any duplicate digits. In a sudoku region each digit appears exactly once. For example, if a digit appears in a row, it cannot be in any other cell in the row. Likewise, each digit can appear in a cage only once. If a digit is in a cage, it cannot appear in that cage again.

Rule of Necessity This rule can be applied to sudoku regions (i.e., row, column, or nonet) or to a cage. In the former case, each region must contain all the digits one to nine. Thus, if all the digits but one appear in a row, the missing digit must appear in the empty cell.

Rule of 45 Each sudoku region (i.e., row, column, or nonet) contains the digits one through nine. Thus, each sudoku region has a total value of 45. If S is the sum of all the cages contained entirely in a region, then the cells not covered must sum to 45-S.

Rule of KThe Rule-of-k is an extension of the Rule-of-1. If there are k cells contained entirely in a region that contain exactly k different possible values, then no other cell in that region can contain any of those k values.

Sum Elimination This strategy examines the different possible ways of making the sum of a cage. Reducing the number of different possible ways of making a sum, can often lead to a potential solution. There are many ways of reducing the number of sums. For example, if a 2-cage has a total of 3, 4, 16, or 17 there is only one combination of values that can be used. (3=2+1, 4=3+1, 16=9+7, and 17=9+8.) 3-cages with only 1 combination are: 6=1+2+3, 7=1+2+4, 23=9+8+6, 24=9+8+7. The sum calculator found in the online player page can be very handy.

Applying the basic strategies. An Example

Here we will use the above strategies to solve a puzzle. You might want to print out the puzzle so you can follow along all the steps.

Rule of 45

Rule of necessity

Rule of 1

Unique Sums

Rule of K

Rule of K

Limited possible sums

Rule of necessity

Limited Possible Sums

Rule of K

Limited Possible Sums

Rule of 1

Rule of K

Rule of Necessity

Rule of 1

All Possible Sums

Rule of Necessity

Limited possible sums

Rule of K

Rule of 1

Limited Possible Sums

Remaining sum

Rule of 1

Rule of K

Rule of necessity

Sum Elimination

Sum elimination

Rule of 1

Range of Totals

Sum Elimination

Rule of 1

Rule of necessity

Remaining Sum

Limited possible sums

Rule of 1

Rule of necessity

Rule of necessity

Rule of 1

Why choose us:

✓ 5000+ Killer Sudoku puzzles to challenge your brain and logical reasoning abilities

✓ Complete Sudoku Daily Challenges and earn trophies.

✓ Participate in seasonal events to win unique medals.

✓ Access to 100 new killer sudoku puzzles weekly.

✓ Auto-save feature allows you to pause and resume without losing progress

✓ Toggle pencil mode on/off as you like.

✓ Hints and notes available to assist when stuck.

✓ Choose a theme that suits your preferences.

✓ Share with friends via Google+, Facebook, Twitter, etc.

What you get:

✓ Four different levels of Killer Sudoku for beginners to advanced solvers: Easy, Medium, Hard, Killer

✓ Precise percentage ranking

✓ Statistics to track progress in each difficulty level

✓ Tons of gameplay challenges to test your brain

✓ Compatible with both phones and tablets

✓ Clear layout

Killer Sudoku is suitable for all ages. Our intuitive interface, easy controls, and balanced difficulty levels cater not only to killer sudoku enthusiasts but also to sudoku and kenken solvers. It's a great way to pass time, improve logical thinking, and enhance memory. Enjoy daily puzzles for killer sudoku lovers, as well as easier versions for beginners.

For those who love killer sudoku, our app offers four difficulty levels and adds 100 new sudoku puzzles every week. Download now and play sudoku daily.

We hope you enjoy Killer Sudoku - Sudoku Puzzles by Beetle Game Studio. For any ideas, questions, or discussions about killer sudoku, please reach out to us via email at support@dailyinnovation.biz. We are always here to assist you.