About Classic Sudoku
The original number puzzle that started it all. Fill a 9x9 grid so every row, column, and 3x3 box contains the digits 1-9 without repeating. Simple rules, endless challenge. Play as many as you want.
How to Play
Start by scanning for cells where only one number fits. Look at what's already in the row, column, and box to eliminate options. Work systematically through easier placements first, then tackle the trickier spots. Use pencil marks to track possibilities if you get stuck.
Classic Sudoku Tips
Casual classic is perfect for practicing technique without the pressure of a daily timer. Take your time to explore different solving paths.
When you stall, switch to scanning by digit across the entire grid. It often reveals a hidden placement.