Online Sudoku Solver & Game - Play Free Sudoku Puzzles Daily
Train your brain with Sudoku Master. Enjoy infinite generated boards across Easy, Medium, and Hard difficulties, featuring pencil draft notes, auto-validation, move history, and timers.
✓ 100% Free & Unlimited
✓ 100% Browser Local & Private
✓ No Registration Required
How to use Sudoku Master Online
- Step 1: Select your difficulty tier and click cells to input numbers from 1 to 9.
- Step 2: Toggle Draft/Notes mode to place candidate numbers inside empty cell spaces.
- Step 3: Resolve all rows, columns, and 3x3 square blocks without repeating any digits.
Frequently Asked Questions
How does the notes/pencil feature work?
Toggling the "Pencil" mode lets you insert small candidate numbers inside a cell, which are automatically cleared when a solid digit is set.
Are the Sudoku boards mathematically valid?
Yes, every board is generated using standard back-tracking sudoku algorithms to ensure a single unique mathematical solution.
Can I check my progress or undo a mistake?
Absolutely! You can check for immediate errors, erase individual cells, or use the Undo/Redo history buttons anytime.