## Live Sudoku book 25000

Sudoku problems from very easy to super difficult. Hints are available.

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## How to play

- Select a cell and put a number.
- Multiple numbers in a cell are regarded as notes.
- Retyping the same number erases the number.
- X deletes all numbers in the cell.
- H is to show hint. See also logics for solving sudoku.
- >>> Read more
- B is to take back a move. It can be used when you correct your mistake or you make assumption.
- R is to restart the problem.
- P is for pencil mode. In pencil mode, checking duplicate of numbers and giving hints are disabled. It is same as solving with a pencil.
- New problem can be selected from the pulldown menu of the level and typing problem number in that level.
- By selecting problem no. 0, random problem is shown with shuffled numbers and rotation.
- Time trial starts when random problem (problem no. 0) starts with pencil mode.
- You can close the web browzer and restart the game anytime by using the same browzer. Current position is always saved in your browser.
- Keyboard can be used from PC. From the keyboard, c copies the current position to clipboard to analyze with Kaidoku.

## About sudoku and kaidoku

- Rule of sudoku
- Kaidoku created the problems and classified by the difficulty.
- You can also download PDF of some of the problems.
- Send your feedback here.