How to Use Notes in Sudoku
What Are Sudoku Notes？
Sudoku Notes are the most important tool you can use when solving a Sudoku puzzle.
When you get stuck and cannot see a clear solution for a cell, you can switch to "Note" mode. This allows you to fill an empty cell with all the possible numbers (or "Candidates") that could legally fit there.
Why Using Notes is Essential
Using notes is the barrier between being a beginner and an advanced solver. When you face Medium, Hard, or Evil puzzles, you can no longer solve them by observation alone.
- It clears your mind: By marking all possibilities, you get a clearer view of the entire board.
- It prevents mistakes: It helps you logically eliminate wrong options before committing to a number.
- It's the foundation for advanced techniques: Nearly all advanced Sudoku solving techniques (like "Naked Pairs" or "X-Wing") rely entirely on accurate and complete notes.
How to Use the Note Feature Correctly
1、Activate Mode: First, find and tap the "Note" (or pencil icon) button in your game to enter Note mode.
2、Mark Candidates: Select an empty cell and then tap all the potential numbers (1-9) that are not already in that cell's row, column, or 3x3 box.
3、Keep Them Updated: When you confirm a final number, remember to go back and delete that number from any notes in the same row, column, and box.
Accuracy is Key
It is very important to fill in your notes correctly. A single mistake in your notes (like missing a candidate or adding one that doesn't belong) will make solving the Sudoku much more difficult and time-consuming.
From Notes to Advanced Strategies
Once your board is filled with accurate notes, you can begin to see the patterns that solve the puzzle.
To learn these advanced techniques, you can find lessons on our website, lovesudoku.net, that teach you exactly how to find solutions based on your notes.