Play Killer Sudoku or Sumdoku. Fill the grid with the numbers 1 to 9, such that each row, column and box contains each number only once. Additionally, a Killer Sudoku grid is divided into cages, each cage has its own background color. The values of the cells in a cage must sum up to the total for that cage, shown in the cage's top left corner. The same number cannot appear in a cage more than once.

Despite the name, the simpler killer sudokus can be easier to solve than regular sudokus, depending on the solver's skill at mental arithmetic; the hardest ones, however, can take hours to solve.

**What is the difference between Sudoku and Killer Sudoku?**

Killer Sudoku is a mix of Sudoku and Kakuro. Your goal is the same as in regular sudoku: fill every row, column and 3x3 region with the numbers 1-9 once. The difference is how you arrive at those numbers. In killer sudoku, no numbers will be filled in at the start.

**How do you solve the ultimate killer in Sudoku?**

**How do you use the 45 rule in Killer Sudoku?**

The Rule of 45 All the numbers in a given row, column or nonet should add up to 45. This rule can also be used smaller puzzles: the number is 21 for a 6x6 puzzle and 10 for a 4x4 puzzle. Take a look at the Killer Sudoku grid below.

**Do Sudoku players have high IQ?**

From this case study it can be concluded that an individual who is skilled at solving Sudoku puzzles likely has a high general IQ. The results of the weak correlation between Sudoku scores and the WAIT test indicates that in some cases a high Sudoku doesn't necessarily mean a high general IQ.

Practising a game like sudoku or using a brain training app might make you better at it but it won't boost your IQ or general brain power, a study claims.01-Aug-2018

**What is a 5 grid Sudoku called?**

Samurai sudoku (also known as Gattai-5 or simply Samurai) is a sudoku variant where there are five overlapping grids that need to be solved. These five grids overlap to form an X shape as shown below. In most versions of Samurai sudoku, each of the five regular sudoku grids can be solved independently of each other.

**What are the 3 rules of Sudoku?**

Sudoku Rules

- Rule 1 - Each row must contain the numbers from 1 to 9, without repetitions.
- Rule 2 - Each column must contain the numbers from 1 to 9, without repetitions.
- Rule 3 - The digits can only occur once per block (nonet)
- Rule 4 - The sum of every single row, column and nonet must equal 45.

**What is the hardest Sudoku in the world?**

A Finnish mathematician claims to have designed the world's most difficult Sudoku. The numerical puzzle took Arto Inkala three months to design, and it has only one solution - one that only the sharpest minds will discover, he told the Daily Telegraph.29-Jun-2012

**What is a hidden triple in Sudoku?**

"Hidden triples" applies when three cells in a row, column, or 3x3 block contain the same three Notes. These three cells also contain other candidates, which may be removed from them.

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