Difficulty Ladder
Easy, Normal, Hard, or the fiendish Master tier—every board is solvable with logic.
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Master Sudoku Your Way
Pick from four handcrafted tiers, jot down notes, and lean on hints or the solver whenever you want.
Smart Notebook
Toggle note mode to store candidates per cell. Notes travel with your save and highlight conflicts.
Guided Hints
Ask for the next logical step or let the solver finish the board when you want to study.
Auto Save
Your puzzle state lives in local storage, so you can close the tab and resume without losing progress.
How It Works
- Choose a difficulty and start with the given clues.
- Fill digits so every row, column, and 3×3 box contains 1–9 exactly once.
- Use notes to track possibilities and request hints if stuck.