GridHearth
Menu

GridHearth Game · Hard Sudoku

Free Hard Sudoku

Free Hard puzzles

Hard puzzle

Loading puzzle…

Choose a puzzle

Current puzzleLoading puzzles…

Nine free Hard Sudoku puzzles.

Help

Restart this puzzle?

Restart clears your saved entries, notes, undo history, selected cell, and time for this puzzle. The starting numbers stay in place.

Reveal this puzzle's solution?

This shows the full solution and ends this attempt. It will be marked assisted. To play this puzzle again, choose Restart.

Nine puzzles that add triples and row-or-column X-Wings. Progress stays in this browser.

New techniques at this level

Hard puzzles may need naked triples and row-or-column X-Wings, in addition to every Medium technique.

Read the technique guide ›