Sudoku Scorer

Know your challenge. Estimate the true difficulty of any Sudoku grid by analyzing clue density and the complexity of required solving techniques.

Puzzles with fewer than 17 clues are usually unsolvable.
Advanced Techniques Required?
Difficulty Level
Medium

Estimated Solve Time: 15-25 Mins.

Empty Cells
53
Logic Score
45

What Makes Sudoku Hard?

I genuinely believe that the number of clues is only half the story. A puzzle with 30 clues could be "Extreme" if those clues are placed in a way that requires complex logic, while a 22-clue puzzle could be "Easy" if it can be solved using simple elimination. Our calculator combines quantity and quality to find the perfect score.

The 17-Clue Limit: It has been mathematically proven that a standard Sudoku puzzle must have at least **17 clues** to have a unique solution. Anything less is a guessing game.

Sudoku Tiers:

  • Easy: 32+ clues. Can be solved with simple "Hidden Singles" and basic scanning.
  • Medium: 26-31 clues. Requires "Naked Pairs" or "Pointing Pairs" to progress.
  • Hard: 20-25 clues. Necessitates advanced logic like "X-Wing" or "Swordfish."
  • Extreme: Under 20 clues or "Evil" logic chains. These often require trial and error or very deep deduction.