Sudoku
1
6
8
2
7
5
9
2
4
9
7
3
4
4
9
6
8
1
3
2
9
4
8
2
1
3
9
3
1
4
7
2
4
9
5
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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Pro 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.
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Did You Know?
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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