Sudoku Variants

Ready for a new challenge beyond classic Sudoku? Explore these exciting variations that add new rules and dimensions to the traditional puzzle.

Killer Sudoku

Killer Sudoku combines Sudoku with Kakuro (cross-sums). The grid is divided into "cages" marked by dotted lines, each with a small number indicating the sum of the cells in that cage.

Rules:

Standard Sudoku rules apply (no repeating numbers in rows, columns, boxes)
Numbers within each cage must sum to the cage's total
Numbers cannot repeat within a cage

Killer Sudoku - Easy

Start with simple cages and clear sums.

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Killer Sudoku - Hard

Complex cages with challenging arithmetic.

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Samurai Sudoku

Samurai Sudoku features five overlapping 9x9 grids arranged in an X pattern. Solve all five grids simultaneously, using the overlapping boxes to guide you.

Features:

Five interconnected 9x9 grids
Four grids share 3x3 boxes with the center grid
Massive 369-cell puzzle for serious solvers

Samurai Sudoku - Medium

A multi-hour challenge for dedicated players.

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Mini Sudoku (4x4)

Perfect for children, beginners, or a quick puzzle fix. Uses a 4x4 grid with numbers 1-4 and 2x2 boxes.

Why Mini Sudoku?

Perfect for kids: Simple to understand and quick to solve
Teaching tool: Introduce Sudoku concepts without overwhelming complexity
Brain warm-up: Quick 5-minute puzzle before tackling harder challenges

Mini Sudoku Collection

Multiple 4x4 puzzles for learning and fun.

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6x6 Sudoku

A stepping stone between 4x4 and 9x9. Uses numbers 1-6 with 2x3 boxes. Great for intermediate learners.

6x6 Sudoku

Bridge the gap to full-size puzzles.

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16x16 Sudoku (Hexadoku)

The ultimate Sudoku challenge. A massive 16x16 grid using hexadecimal digits 0-F (or numbers 1-16).

Features:

256 total cells
4x4 boxes instead of 3x3
Can take hours to solve
Uses hex digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F

16x16 Sudoku - Medium

A massive puzzle for patient solvers.

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16x16 Sudoku - Hard

The ultimate test of Sudoku mastery.

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Coming Soon

We're working on additional variants:

Diagonal Sudoku (Sudoku X): Standard rules plus both diagonals must contain 1-9
Jigsaw Sudoku: Irregular-shaped boxes instead of 3x3 squares
Hyper Sudoku: Four additional 3x3 regions that also must contain 1-9

Why Try Variants?

Prevent boredom: Fresh challenges keep Sudoku exciting
Develop new skills: Each variant requires slightly different logic
Increase difficulty: Master classic Sudoku? Variants offer new mountains to climb
Better understanding: Variants deepen your appreciation of Sudoku logic

Ready to stick with classic Sudoku? Play today's daily puzzle