Initial setting Sudoku is a popular logic game for one player. The objective is to fill numbers 1-9 in a grid of 9x9 squares in such a way that every row, column and group (3x3 subgrid) contains each number exactly once. Sudoku was published by Howard Garns in 1979 (named as Number place). The puzzle became popular in Japan, where it has been published since 1986 under the name Suuji wa dokushin ni kagiru (single number). In 2005 Sudoku became popular worldwide. How to solve Sudoku? Sudoku is usually solved using so called candidates. Candidates are numbers, which can be filled in a given cell. In the beginning every cell has all candidates 1-9, which are one by one eliminated by applying less or more complex mental structures. When there remains only one candidate number, than it is a solution for the given cell. Basic rules The most straightforward strategy is just to follow the rules and eliminate duplicates in rows, columns and groups. Although is this approach very simple,
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