Play Sudoku Puzzles Online

To Play Sudoku:

1. Objective
Fill a 9x9 grid with digits so that each column, each row, and each 3x3 subgrid contains numbers from 1 to 9.

2. Reveal Character
If you're stuck, use this option to reveal a cell. Be cautious; a time penalty applies for each cell revealed, increasing with every use. It's best to use this sparingly to maintain a good completion time.

3. Reveal Puzzle
For a broader hint, you can reveal the entire puzzle. However, be prepared for a significant time penalty corresponding to the complexity of the puzzle. Reserve this for a situation when you're completely stuck.

4. Gameplay
Start with a partially filled grid. Use logic and deduction to fill in the missing numbers. Scan rows, columns, and subgrids for missing numbers and eliminate possibilities based on existing numbers. Look for "singleton" candidates—cells with only one possible number based on their surroundings.

5. Logic Over Guesswork
Avoid guessing; every Sudoku puzzle has a logical solution. With practice, you'll improve your skills and enjoy the challenge of solving even the toughest puzzles while keeping your time score intact.