You solve sudoku puzzles with reasoning and logic. Sudoku is played on a 9x9 grid, divided into smaller regions (3x3 grids). Rules:
Fill all the empty cells in the sudoku puzzle with numbers between 1 and 9
A number can appear only once in each row of the sudoku puzzle
A number can appear only once in each column of the sudoku puzzle
A number can appear only once in each of the regions
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Sudoku puzzles, from easy to the hardest ones are solved with observation and logic.
For difficult puzzles here is a proven sudoku strategy: try finding the right square to hold a number instead of looking for the right number to go into a square: