##### Sudoku is the Hobby You Didn’t Know You Needed

Sudoku is one of the most popular puzzle games ever. It is fun, entertaining and 100% logic based. The game, invented in Switzerland, gained popularity in Japan in the late 1980’s, where it was given its name: Sudoku is the short form of Su-ji wadokushinnikagiru, which can be translated into "the numbers must be single".

A classic 9x9 Sudoku puzzle tab is formed by 81 cells, which are divided into a total of 9 rows, columns, and regions (squares). The main goal of a 9x9 Sudoku game is to place numbers going from 1 to 9 in the cells so that they never appear more than once in each row, column and region. At the beginning of the game, you will be given 17, 22 or 30 numbers to guide your choices. What makes sudokus so fascinating and fun is that, no matter their difficulty, there is only one correct answer.

Besides the classic Sudoku, there are infinite variants of this puzzle game. Some of the most popular are:

1. Diagonal
It is structurally similar to the classic sudoku, but with a diagonal construction, which means the numbers will have to appear only once on the two main diagonals.
2. Irregular
Structured quite literally like a puzzle, an irregular sudoku follows the same principle of the classic sudoku, but instead of squares as regions, there are irregular shapes to make the game more exciting.
3. Isosudoku
Following the same classic sudoku concept, the structure of this puzzle is not a square, but a hexagon, which allows a number of different shapes and diagonal lines to be created and added into the difficulties of the game.
4. Kropki
This complex type of sudoku is perfect for people who love maths. Besides the rules of classic 9x9, there is an addition of a digit in the empty squares, which, like the numbers, only appears once in each row, region and column. If the difference between two numbers next to each other equals 1, the dot between them will be white; if the number is a half of the one next to it, then the dot between them will be black.
5. Killer
Killer sudokus are seemingly structurally similar to the classic 9x9 ones. However, the rules are slightly different. You will have to put a number into the empty cells so that the sum of the numbers on certain highlighted regions will equal the number at the corner of the outline.
6. Little Killer
In this “little” version of the killer, you will have to put a number in each cell so that they will appear only once in regions, columns and rows; however, there will be an addition of numbers with arrows pointing at the cells before you start the game: these are the sum of the numbers in their direction.
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