Hard Sudoku

About Hard Sudoku

Hard Sudoku is for those who want a tougher logic challenge. Obvious placements are fewer here, and you will often need to work with candidates and relationships between multiple parts of the Sudoku board to make progress.

Tips for Hard Sudoku

Fill in candidate notes and look for patterns that eliminate potential numbers. If you get stuck, go through each number from 1 to 9 and check where it can still be placed. Sometimes a single elimination opens up the rest of the puzzle.

Want to change difficulty?

Try Easy, Medium, or Expert.