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Sudoku Today

Description: Whether you're a Sudoku beginner or master, test yourself with three levels of difficulty. Everyday is a new challenge.
Instructions: Objective: Fill the 9x9 grid so that each column, each row, and each of the nine 3x3 blocks contains the digits from 1 to 9, only one time each (that is, exclusively). Pencil Marks: The usual approach to solve a Sudoku board is via pencil marks. They remind you which values are still possible for the current cell. You can toggle the pencil marks by clicking on them.
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