The Many Types of Sudoku: A Tour of the Variants

Classic 9x9 Sudoku is only the beginning. From Killer to Samurai to Diagonal, here is a friendly tour of the most popular Sudoku variants and what makes each one tick.

Once the classic grid feels comfortable, a whole family of variants opens up. Each one keeps the core idea — fill the grid so every unit holds each symbol once — but adds a twist that changes how you think. Here is a tour of the ones worth knowing.

Classic Sudoku

The one everyone knows: a nine-by-nine grid, nine three-by-three boxes, and the digits 1 to 9 placed once in every row, column, and box. It is the baseline against which every variant is measured, and the version you play on vSudoku. If you are new, master this before branching out.

Mini Sudoku (4x4 and 6x6)

Smaller grids use fewer digits — 1 to 4 on a four-by-four board, or 1 to 6 on a six-by-six. They solve in a minute or two and are perfect for children or for anyone learning the logic for the first time. The rules scale down cleanly: each row, column, and box still holds every digit once.

Diagonal (X) Sudoku

This variant looks exactly like a classic grid but adds two rules: the two main diagonals must also contain the digits 1 to 9 without repeats. Those extra constraints give you more footholds, but they also mean a classic-trained eye can miss moves. It is a gentle first step into variant solving.

Killer Sudoku

Killer Sudoku blends Sudoku with light arithmetic. The grid is divided into dotted-outline groups called cages, and each cage shows a target sum. The digits in a cage must add up to that total and cannot repeat within the cage. You still obey all the classic rules on top of this. It rewards players who enjoy a little number sense alongside pure logic, and it is one of the most popular variants in the world.

Hyper and Windoku

These add extra highlighted regions inside the grid that must also contain 1 to 9. In Windoku, four inner three-by-three zones are shaded; in Hyper Sudoku, they sit slightly offset. The additional regions overlap the boxes, creating rich chains of deduction that classic solvers find refreshingly tricky.

Jigsaw (Irregular) Sudoku

Here the nine boxes are not neat three-by-three squares. Instead, the grid is carved into nine irregular, jigsaw-shaped regions, each of which must hold the digits 1 to 9. The rows and columns work as normal. Because the regions bend and weave, your usual box-scanning instincts need recalibrating, which makes jigsaw puzzles feel genuinely new even to veterans.

Samurai Sudoku

Samurai is five classic grids overlapping in a plus shape, sharing their corner boxes. Solving one grid feeds information into the next through the shared regions. A single Samurai puzzle can absorb a long afternoon, and finishing one is a real sense of achievement. It is a favourite for players who want a bigger, slower challenge.

Which should you try next?

• Comfortable with classic and want a small step up: try Diagonal Sudoku.
• Enjoy a little arithmetic: Killer Sudoku is the natural pick.
• Want your instincts genuinely challenged: Jigsaw Sudoku.
• Craving a long, immersive solve: Samurai Sudoku.

Whichever you choose, the skills transfer. The scanning, note-keeping, and single-spotting techniques you build on the classic grid are the foundation for every variant. Keep sharpening them on vSudoku, and the rest of the family becomes far less intimidating.

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