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sudoku

Solving a sudoku puzzle can be rather tricky, but the rules of the game are quite simple.

The objective of sudoku is to enter a digit from 1 through 9 in each cell, in such a way that:

  1. Each horizontal row (shown in pink) contains each digit exactly once
  2. Each vertical column (shown in yellow) contains each digit exactly once
  3. Each subgrid or region (shown in green) contains each digit exactly once