Fill each cell so every row, column, and sub-grid contains every digit exactly once.
Choose between 6x6 (digits 1–6, 2x3 blocks) or classic 9x9 (digits 1–9, 3x3 blocks).
Toggle "Pencil Mode" to write candidate notes in cells before committing an answer.
Use the "Validate" button to check for conflicts or highlight duplicate digits.
💡Tactical Strategy Tips
Start by scanning rows and boxes that already possess 4 or more solved numbers.
Use pencil marks to identify naked pairs and eliminate impossible candidates.
6x6 mode is ideal for quick 5-minute mental breaks on mobile screens.
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