Sudoku

Technique Journey

Bite-sized lessons that teach one Sudoku deduction technique at a time. 0 of 15 complete.

  1. Naked Singlesnaked single

    Spot the cell where only one digit fits.

  2. Naked Singles — Practicenaked single

    Eight cells, one technique. Scan the whole board.

  3. Hidden Singleshidden single

    Find the only home for a digit inside one unit.

  4. Hidden Singles — Practicehidden single

    Scan each unit until a digit has only one landing spot.

  5. Singles — Mixed Practicemixed

    Use naked and hidden singles together.

  6. Pointing Pairspointing pair

    Use a box pattern to clean up a row or column.

  7. Box-Line Reductionbox line-reduction

    Use a row or column pattern to clean up a box.

  8. Intersections — Mixed Practicemixed

    Switch between pointing pairs and box-line reductions.

  9. Naked Pairsnaked pair

    Two cells reserve two digits for themselves.

  10. Naked Triplesnaked triple

    Three cells reserve three digits together.

  11. Hidden Pairshidden pair

    Two digits hide inside the same two cells.

  12. Subsets — Mixed Practicemixed

    Practice pairs, triples, and hidden pairs together.

  13. X-Wingx wing

    Use two matching lines to eliminate a digit.

  14. Swordfishswordfish

    Track one digit across three rows or columns.

  15. Technique Journey Capstonemixed

    Bring the whole toolkit together.

Progress is saved on this device. Sign-in sync coming soon.