# Sudoku Rules

The most common version of Sudoku is composed by a square grid of 9 rows and 9 columns for a total of 81 cells. The grid is subdivided into nine 3×3 blocks or subgrids. Some of the 81 cells are filled in with numbers from 1 to 9. These filled-in cells are called givens. The goal is to fill in the whole grid using the nine digits so that each row, each column, and each block contains each number exactly once.

Usually, the initial grid is partially completed and a good sudoku should have an unique solution.

# Sudoku Glossary

Some terms related to Sudoku:

grid: the most common Sudoku is a square composed by 9x9 cells.

box, block, zone, subgrid: each one of the nine 3x3 grids that compose the whole square.

stack: three vertical connected blocks.

band: three horizontal connected blocks.

chute: either a band or a stack.

given, clue: the initial defined values.

proper puzzle: Sudoku with a unique solution.

irreducible puzzle: is a proper puzzle where no givens can be removed leaving it a proper puzzle.

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