Nevertheless, on some websites on the Internet, under the guise of complicated puzzles, the user is offered options for sudoku with several solutions, as well as with branches of the actual solution. Properly composed puzzle has only one solution. Some puzzles can be solved in a few minutes, others can spend hours. The simplest ones are solved deductively: there is always at least one cell where only one number fits. The complexity of sudoku depends on the number of initially filled cells and on the methods to be used to solve it. The player is required to fill the free cells with numbers from 1 to 9 so that in each row, in each column and in each small 3 × 3 square each digit would meet only once. In them, at the beginning of the game, there are some numbers (from 1 to 9), called prompts. Thus, the entire playing field consists of 81 cells. The playing field is a 9 × 9 square, divided into smaller squares with a side of 3 cells. Game Sudoku is a popular form of leisure. Sudoku actively publish newspapers and magazines around the world, sudoku collections are published in large editions. Sometimes sudoku is called a magic square, which in general is wrong, as sudoku is a 9th order Latin square.
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