Sudoku Hints: 9 Moves to Use When You Are Stuck

If you searched for sudoku hints, you probably do not want the full answer. You want the next productive move. This guide gives you exactly that: a logic-first checklist you can run whenever the grid stalls.

The 9 Best Sudoku Hints (In Order)

1. Re-scan for full houses: one empty cell in a row, column, or box.
2. Find naked singles: only one candidate fits a specific cell.
3. Find hidden singles: one digit can go in only one cell in a unit.
4. Refresh candidates: remove stale notes before deeper analysis.
5. Check naked pairs: lock two digits to two cells in a unit.
6. Check hidden pairs: two digits appear only in two cells.
7. Use box-line reduction: eliminate candidates along shared lines.
8. Re-run singles: eliminations often create new easy placements.
9. Only then use advanced logic: X-Wing or forcing chains as needed.

The best Sudoku hint is not a number. It is a methodical next step.

What Makes a Good Hint?

A good hint narrows your search space. It should tell you where to look, not what to write. For example, "there is a hidden single in box 6" is better than filling a random digit for you.

Fast Rescue Routine (2 Minutes)

1. Pick one digit, like 5, and scan all rows and boxes.
2. Pick one box and verify all notes are accurate.
3. Search only that box's intersecting row and column lines.
4. Look for one elimination, then re-scan singles.