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

You submitted ...4..7....6.8.1..7....3.5.8.7.3...4..1.......6....2..3....5..8.4.9....2....1.6..

Estimated Difficulty Level: **Extremely Hard** (Difficulty Score: 6 out of 6)

Enter a sudoku string (see example):