Sudoku Beyond Basics: Candidates, Pairs, and Speed

Candidate notes are not optional

Hard Sudoku is bookkeeping. If you are not marking candidates, you are guessing with extra steps.

On Pokesjoy Games Sudoku boards, use the notes tool early. Erase aggressively when a digit locks.

Beginners solve naked singles. Intermediate players eliminate candidates by row, column, and box overlap.

Pairs and locked sets

Naked pairs: two cells in a unit share the same two candidates—those digits leave other cells in the unit.

Hidden singles still appear in hard puzzles; scan boxes before hunting exotic patterns.

When stuck, pick the unit with the fewest empty cells. Constraint density speeds deductions.

Advanced without mysticism

X-Wing is just the same digit lining up in two rows across two columns. No magic—pattern recognition.

Coloring and chains appear in expert apps; browser Sudoku rarely needs them if notes are tidy.

Speed comes from scan order: digits 1–9 sweep, then box sweep, repeat.

Training plan

One hard puzzle daily beats ten easy puzzles. Time yourself only after accuracy is stable.

Review mistakes: which candidate you forgot to remove tells you what skill to drill next.

FAQ

Sudoku study notes.

• Guess or logic? Logic should carry you; one controlled guess is ok on timed modes.
• Eraser habits? Update notes after every placement, not at the end.
• Mobile vs paper? Mobile notes are faster once you trust the UI.