Sudoku
8
3
2
9
1
2
1
4
9
5
7
4
5
6
5
6
1
5
4
9
4
5
2
7
9
5
2
9
1
4
5
5
4
3
1
Sudoku is a logic-based number puzzle. Fill a 9×9 grid so every row, column, and 3×3 box contains digits 1–9 exactly once. A valid puzzle has exactly one solution. Sudoku requires no arithmetic — just logical deduction.
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Tip: Start by finding boxes, rows, or columns that already have 7–8 digits filled — the 9th is trivial. Look for digits that appear frequently in the given cells to quickly eliminate possibilities.
- 1Naked singles: a cell can only contain one digit
- 2Hidden singles: a digit can only go in one cell within a row/column/box
- 3Naked pairs/triples: eliminate candidates from other cells
- 4Advanced: X-wings, swordfish, and coloring techniques
| Level | Given clues | Techniques needed |
|---|---|---|
| Easy | 36–50 | Naked singles only |
| Medium | 28–35 | Hidden singles |
| Hard | 22–27 | Naked pairs, pointing pairs |
| Expert | 17–21 | X-wing, swordfish |
| Diabolical | 17 | Advanced forcing chains |
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Fun Fact
Sudoku was invented by American architect Howard Garns in 1979 (as 'Number Place') and popularized in Japan in 1986 by Maki Kaji, who named it 'Sudoku' (a Japanese abbreviation of 'the digits must remain single'). It went global after appearing in British newspapers in 2004.
References
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