Five minutes of Sudoku: find one good move, not a fast finish
Not sure where to look first? Try a short practice routine with one modest goal: a move you can explain.
Give yourself a smaller finish line
Your coffee is still warm. You open a puzzle, stare at the grid and feel tempted to put something—anything—in a blank square. Before you do, try a different goal: find one number whose position you can explain.
Five minutes is a convenient practice window, not a promise of completion or a scientifically tested brain-training dose. Start with 4×4 if the full board feels busy; use an easy 9×9 when the rules feel familiar.
Minute one: make the board smaller
Pick a row, column or box with plenty of filled cells and list its missing digits. You are choosing a manageable place to look, not a region guaranteed to contain a move.
Suppose a row is missing 2 and 7. Its two empty cells must share those digits. That does not yet tell you which digit belongs in which cell. Resist turning a possibility into an answer.
Minutes two and three: ask what rules a digit out
Check each empty cell’s column and box. If cell A shares a column with an existing 7, it cannot be 7. Provided 2 is still legal, A must be 2; the other gap in that row, B, must then be 7.
This is a local reasoning example, not a complete puzzle. If both digits are ruled out, investigate an earlier mistake instead of forcing a placement.
| Observation | Conclusion |
|---|---|
| The row lacks 2 and 7 | A and B are restricted to 2 or 7 |
| A sees a 7 in its column; 2 remains legal | A = 2 |
| B is the row’s only remaining gap | B = 7 |
Both A and B still allow 2 and 7. Can you choose whichever feels right?
Show the explanation
No. Having no immediate conflict does not prove a number correct. Keep both candidates and inspect another region.
Minute four: follow the move you just made
After placing a digit, revisit its row, column and box. If you use complete notes, remove that digit from the related empty cells. Cells outside all three regions are unaffected.
Update before rushing into another move. One change at a time makes it easier to trace a mistake and notice a new single.
Minute five: leave yourself a thread to follow
Finish with a sentence: “This column already had a 7, so this cell had to be 2.” If you found no placement, note which region you checked and what you will look at next.
You do not need to finish the puzzle or reveal every answer to make the session count. A reasoned elimination teaches you more about your method than a lucky guess.