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# Sudoku
Sudoku is a puzzle that's based on filling a grid with numbers that is hugely popular even among [normies](normie.md) such as grandmas and grandpas who find this stuff in magazines for elderly people. The goal is to fill in all squares of a 9x9 grid, prefilled with a few clue digits, with digits 1 to 9 so that no digit repeats in any column, row and 3x3 subgrid. It is like a crosswords puzzle for people who lack general knowledge, but it's also pretty [suckless](suckless.md), pure logic-based puzzle whose generation and solving can be relatively easily automatized (unlike generating crosswords which requires some big databases). The puzzle is a pretty [fun](fun.md) singleplayer [game](game.md), posing opportunities for nice [mathematical](math.md) research and analysis as well as a comfy [programming](programming.md) exercise. Sudokus are a bit similar to [magic squares](magic_square.md).
Sudoku is a puzzle that's based on filling a grid with numbers that is hugely popular even among [normies](normie.md) such as grandmas and grandpas who find this stuff in magazines for elderly people. The goal is to fill in all squares of a 9x9 grid, prefilled with a few clue digits, with digits 1 to 9 so that no digit repeats in any column, row and 3x3 subgrid. It is like a crosswords puzzle for people who lack general knowledge, but it's also pretty [suckless](suckless.md), pure logic-based puzzle whose generation and solving can be relatively easily automatized (unlike generating crosswords which requires some big databases). The puzzle is a pretty [fun](fun.md) singleplayer [game](game.md), posing opportunities for nice [mathematical](math.md) research and analysis as well as a comfy [programming](programming.md) exercise. Sudokus are a bit similar to [magic squares](magic_square.md). There also exist many similar kinds of puzzles that work on the principle of filling a grid so as to satisfy certain rules given initial clues, many of these are implemented e.g. in [Simon Tatham's Portable Puzzle Collection](stppc.md).
Curiously sudoku has its origins in agricultural designs in which people wanted to lay out fields of different plants in more or less uniform distributions (or something like that, there are some papers about this from 1950s). The puzzle itself became popular in Japan in about 1980s and experienced a boom of popularity in the western world some time after 2000.