Tier 1 · Lesson 1
The Rules
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Step 1 of 10
Welcome to Sudoku — the puzzle of nines. The grid is 9×9, divided into nine 3×3 boxes. There are just three rules. You'll learn each one with an example, then practice spotting and applying them.
Welcome to Sudoku — the puzzle of nines. The grid is 9×9, divided into nine 3×3 boxes. There are just three rules. You'll learn each one with an example, then practice spotting and applying them.