súdoch

Súdoch, also known as Sudoku, is a popular logic-based number-placement puzzle. The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids that compose the grid contain all of the digits from 1 to 9. The puzzle is created by giving the player a partially completed grid, which for a well-posed puzzle, has a single solution.

The puzzle was invented by Howard Garns in 1979, but it gained widespread popularity in Japan in the late 1980s, where it was published under the name "Number Place." The puzzle was then introduced to the United States by Dell Magazines in 1997, and it quickly became a global phenomenon.

Sudoku puzzles come in various difficulties, ranging from easy to extremely challenging. The difficulty of a puzzle is determined by the number of given clues, with fewer clues resulting in a more difficult puzzle. The minimum number of clues required to guarantee a unique solution is 17, but most puzzles contain between 30 and 35 clues.

Sudoku can be played on paper, using a computer, or on mobile devices. There are numerous variations of the puzzle, including different grid sizes, such as 4x4, 6x6, or 16x16, as well as three-dimensional versions and puzzles that incorporate other themes, such as letters or words.

The puzzle's popularity can be attributed to its simplicity, accessibility, and the satisfaction of solving it. Sudoku has also been used as a tool for educational purposes, helping to improve logical thinking, concentration, and problem-solving skills.