If you are a beginner at Sudoku, here are some tips for you:

1. Start with the easy levels first to get familiar with the rules and strategies. As you progress, you can move on to more challenging levels.

2. Look for the "easiest" moves first. This usually means finding the squares with the fewest possible numbers and filling them in first. This will help you create a solid foundation for the rest of the puzzle.

3. Use the "elimination method" often. This involves looking at the numbers in a row, column, or 3x3 box and eliminating the possibilities for the other squares based on what's already there.

4. Don't be afraid to make mistakes. Sudoku is a game of trial and error, and it's okay to backtrack if you realize you've made a mistake.

5. Use "Undo" and "Restart" change your answers. This flexibility will help you as you work through the puzzle.

6. Remember to take breaks if you get stuck. Sometimes, stepping away from the puzzle for a bit can help you come back with fresh eyes and a new perspective.

With these tips, you'll be well on your way to becoming a Sudoku master! Good luck and have fun!

Of course, if you are still unable to solve the Sudoku puzzle, you can use online puzzle tools: Online solving of Sudoku puzzles.