Easy
Build a steady singles routine
Naked and hidden singles, with hints that explain one placement.
Play Easy ›GridHearth Game · Sudoku
Choose Easy, Medium, or Hard Sudoku
Play 27 free puzzles—nine each at Easy, Medium, and Hard. Progress saves in this browser, and optional hints explain a logical next move from your current board.
Free on this site
- Practice
- 27 free puzzles · 9 per level
- Techniques
- Singles through X-Wing
- Progress
- Stored in this browser
Medium
Add locked candidates and pairs
Practice useful eliminations when singles alone are not enough.
Play Medium ›Hard
Work with triples and X-Wings
Use the techniques above to keep solving without guessing.
Play Hard ›Online practice
Choose a puzzle and take your time
Each puzzle has one solution. Notes, undo, logical hints, checking, and an optional full solution are available without an account.
Open Easy practice ›Learn
Quick technique reference
Start with singles, then add locked candidates, pairs, triples, and row-or-column X-Wings as you move up. For rules and worked examples, read the full how-to guide.
Open the quick reference ›GridHearth Press · Sudoku Practice
Find your Sudoku practice path
Explore the Sudoku Practice series and choose the level that suits you. Each book page shows its current Amazon marketplace options.
Volume 1 · Easy
Easy Sudoku Practice: Volume 1
180 puzzles · Naked and hidden singles
Volume 2 · Medium
Medium Sudoku Practice: Volume 2
180 puzzles · Locked candidates and pairs
Volume 3 · Hard
Hard Sudoku Practice: Volume 3
180 puzzles · Naked triples and X-Wings
Volume 4 · Mixed
Mixed Sudoku Practice: Volume 4
270 puzzles · Easy, Medium, Hard, and a Mixed finish