Evil Sudoku online
A very hard Sudoku challenge with sparse starting clues and long chains of deduction.
Play Evil SudokuWho is Evil Sudoku for?
This level is best suited to advanced solvers who are comfortable with candidate elimination. The puzzle runs directly in your browser, so there is nothing to download.
Helpful features
- Candidate notes for uncertain squares
- Hints with a short logic explanation
- Undo, erase, pause and resume controls
- Optional account progress, points and friend challenges
A useful solving approach
Begin by scanning for missing digits in the most complete rows, columns and boxes. Recheck the grid after every confirmed number because one placement often creates the next opportunity.