SUDOKU

The standard 9x9 puzzle. Fill every row, column, and 3x3 box with digits 1-9.

Cells are grouped into dashed cages with target sums. Digits in each cage must add up to the total without repeating.

Five overlapping 9x9 grids sharing corner boxes. All five must be solved simultaneously.

The two main diagonals must also each contain digits 1-9 without repeats.

Nine irregular, interlocking regions replace the standard 3x3 boxes. Same rules, new shapes.

Four extra shaded 3x3 window regions must each contain digits 1-9, on top of the normal rules.

Digits along an arrow sum to the circled number at the arrow base.

Shaded cells must contain even digits and unshaded cells must contain odd digits.

White dots mark adjacent pairs that differ by exactly 1. Pairs without a dot must not be consecutive.

Triangles between every pair of adjacent cells point toward the smaller of the two digits.

Clues around the edge tell you how many buildings are visible looking into each row or column.

4x4 grid with numbers 1-4. The simplest form of sudoku, great for beginners.

16x16 grid using digits 1-9 and letters A-G. Every row, column, and 4x4 box must be complete.

Letters replace digits using a hidden nine-letter word. Find it reading across one row or down one column.

Nine colors replace the digits 1-9. Each color must appear exactly once in every row, column, and 3x3 box.

Nine cells forming a star must contain each digit 1–9, on top of standard sudoku rules.

Six argyle diagonals — each must contain distinct digits alongside standard row, column, and box rules.

Four overlapping 9×9 grids sharing a central region, forming a butterfly shape on a 12×12 board.

Colored chains of cells must each contain a set of consecutive digits, in any order.

A triangular sudoku — rows, columns, and the main diagonal must each contain distinct digits.