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Sudoku

NumberFeatured

The logic grid that became a global obsession.

Sudoku is a number-placement puzzle where the goal is to fill a 9×9 grid so that every row, column, and 3×3 box contains the digits 1 through 9. Born from Latin-square theory and popularised by Japanese publisher Nikoli in the 1980s, it remains the world's most-played pencil puzzle.

Original ruleset

The classic

Classic 9×9

The original Sudoku: a 9×9 grid, a handful of given digits, and pure logic to fill the rest.

Easy 5-30 min logic, number, grid, classic

Modern variants

Reimagined

Sudoku X (Diagonals)

Adds two more constraints: both main diagonals must also contain 1–9. A small rule change that completely reshapes the deduction landscape.

Hard 10-40 min logic, number, grid, diagonal

Color Sudoku

Replace digits with nine distinct colors. Same constraints, different brain region — visually intuitive and surprisingly tricky.

Medium 5-25 min logic, color, visual, variant

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