A sudoku puzzle can be very easy, extremely hard, or somewhere in between, depending on the techniques required to solve it. This page estimates the difficulty level of a given puzzle based on the difficulty of the strategies that must be used to solve it. Enter a puzzle string below (see the main sudoku page and look above the puzzle for an example) and click Grade Puzzle to find out the estimated difficulty level.

### Sudoku Difficulty Estimator

Example: 847........9.2....2..8.3.....2....64....5...148.1...9.......6.8...7.493....5...4.