How to Get Better at Sudoku: Techniques, Practice Regimen & Resources

Foundation

• Rules: 9×9 grid, nine 3×3 boxes. Digits 1–9 once per row, column, box.
• Notation: Use pencil marks (candidates) in every cell—digital apps auto-track.

Core Techniques (Learn in Order)

1. Naked Single: Only one candidate in a cell → place it.
2. Hidden Single: A digit fits only one cell in a unit (row/col/box).
3. Naked Pair/Triple: 2/3 cells share same 2/3 candidates → eliminate elsewhere in unit.
4. Pointing Pairs / Box-Line Reduction: Candidate locked in one row/col within a box → remove from rest of row/col.
5. X-Wing: Two rows, same two columns for a digit → eliminate from those columns.
6. Swordfish / Jellyfish: 3/4 row/col extension of X-Wing.
7. XY-Wing / XYZ-Wing: Three-cell pivot chains.
8. Unique Rectangle: Avoid deadly pattern (multiple solutions).

Practice Regimen

• Daily: 1 Easy, 1 Medium, 1 Hard (NYT, Sudoku.com, Cracking the Cryptic app).
• Review: Re-solve yesterday's Hard without pencil marks.
• Timed: Track averages; aim to halve Medium time in 3 months.
• Variant Exposure: Killer, Thermo, Arrow, Kropki—sharpen logic flexibility.

Resources

• Hodoku (PC) – Trainer with hint engine, all techniques.
• Cracking the Cryptic (YouTube) – World-class solve-alongs.
• SudokuWiki.org – Interactive technique encyclopedia.

Progress = pattern recognition + candidate discipline. No guessing needed.