When (Not) to Guess in Sudoku

Proper Sudoku puzzles have a unique solution reachable by logic. If you feel forced to guess, try these steps first:

1. Re-scan all boxes for hidden singles.
2. Refresh pencil marks — an outdated note hides the next move.
3. Try solving a different region first.

Guessing vs learning

Guessing works in casual play but teaches bad habits. Use hints to learn the logical step instead.

Hard puzzles

Hard puzzles may require pairs, triples, or X-Wing patterns. Master singles and elimination before advancing.

Read all solving techniques or play with hints enabled.