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- What is the goal of Sudoku?
The goal of Sudoku is to fill a 9x9 grid with numbers so that each column, each row, and each of the nine 3x3 boxes that compose the grid contain every digit from 1 to 9. The game starts with a partially completed grid, for which the game has a single solution.

- What constitutes a "wrong move" in Sudoku?
If any row, column, or box contains each number from 1 to 9 more than once, the solution is deemed incorrect. Use the "Stop Mistakes" setting to automatically block a wrong move.

- What's the Timer for?
Sudoku is a great way to train your brain and improve your concentration. The timer is a motivational tool to help your brain learn - over time - how to solve Sudoku puzzles faster.

- What do the options Easy, Medium, and Hard mean?
In Easy mode, the Sudoku game starts with more pre-filled numbers. In Hard mode, the game of Sudoku starts with a smaller number of pre-filled numbers.

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