Is Suguru a Type of Sudoku?

It's one of the most common questions newcomers ask: Suguru is a grid full of numbers solved by logic, so surely it's just another flavour of Sudoku? It's an easy assumption to make — the two even sit side by side on many newspaper puzzle pages. But the answer is a clear and slightly surprising no. Suguru is not a type of Sudoku, and the reason why reveals what makes Suguru its own distinct, rather clever puzzle. Here's how Suguru and Sudoku really differ, and why one missing rule changes the whole game. Want to feel the difference for yourself? Play a Suguru puzzle and notice what's not there.

The short answer

No — Suguru is not a Sudoku variant. They're both number-placement logic puzzles, and they share that satisfying "I can prove what goes here" feeling, but Suguru is built on completely different rules. The headline difference is simple and decisive: Sudoku is defined by its row, column and box rules. Suguru has none of them.

A Sudoku variant — like Killer Sudoku or Jigsaw Sudoku — keeps the core Sudoku discipline (each digit once per row, once per column) and adds something on top. Suguru removes that discipline entirely. That alone disqualifies it from being a Sudoku at all.

What makes a puzzle a "Sudoku"

To see why Suguru doesn't qualify, it helps to pin down what Sudoku actually is. Every Sudoku, and every true Sudoku variant, rests on one foundational idea: the Latin square. In a standard Sudoku you fill a 9×9 grid so that each digit 1-9 appears exactly once in every row and every column (plus once in each 3×3 box). That "no repeats per line" rule is the heart and soul of Sudoku.

Take it away and you simply don't have a Sudoku, however many numbers are on the grid. And Suguru takes it away.

What Suguru does instead

Suguru replaces the row-and-column rule with two completely different ones:

1. Each cage of N cells holds the digits 1 to N. The grid is divided into little cages (blocks) of varying sizes, and each is filled with its own run of numbers — a three-cell cage gets 1-2-3, a five-cell cage gets 1-to-5.
2. No two identical digits may touch, including diagonally.

The consequence is striking: in Suguru, a digit can appear several times in the same row or column — that's perfectly legal, as long as no two copies are next to each other. In Sudoku, that would be an instant rule break. This single freedom is the clearest proof that Suguru is playing a different game.

Side by side

	Sudoku	Suguru
Grid	Fixed 9×9 with 3×3 boxes	Cages of varying size, any grid size
Defining rule	Each digit once per row, column and box	Each cage holds 1 to N; no equal digits touching
Digits used	Always 1-9	1 to N, where N is the cage size
Repeats in a row?	Never allowed	Allowed, if they don't touch
Adjacency rule?	No	Yes — including diagonals

So why do they look so alike?

The resemblance is real but skin-deep. Both are square-ish grids of digits, both are solved purely by deduction with a single guaranteed solution, and both reward the same patient, eliminating mindset. They also share a heritage — Suguru, like many modern logic puzzles, comes from the rich Japanese puzzle tradition, and you'll often find the two printed together because they appeal to the same solvers.

But appealing to the same people isn't the same as being the same puzzle. Once you've solved a few Suguru, the difference becomes obvious: you stop thinking in rows and columns and start thinking about cages and which numbers can sit beside which. (If you're curious how Suguru compares to puzzles that genuinely are Sudoku relatives, our Suguru vs Killer Sudoku piece is a good next read.)

The verdict

Suguru is a number-placement logic puzzle, a member of the broad family that includes Sudoku, KenKen and others — but it is not a Sudoku or a Sudoku variant. It swaps Sudoku's defining row-and-column rule for a cage rule and a no-touching rule, and that swap gives it a character all its own: lighter, more spatial, and refreshingly free of the "every line must be perfect" pressure. If you've found Sudoku a touch repetitive, that difference is exactly why Suguru feels like a breath of fresh air.

The best way to appreciate it is to play one and feel the missing row-and-column rule for yourself. Play a Suguru puzzle now, or learn the rules and see just how different it really is.

Frequently asked questions

Is Suguru a type of Sudoku?

No. Although Suguru is a number-placement logic puzzle that looks similar to Sudoku, it is not a Sudoku or a Sudoku variant. Sudoku is defined by its rule that each digit appears once per row, column and box, and Suguru has no such rule. Suguru instead fills cages with 1-to-N and forbids identical digits from touching, including diagonally.

What is the difference between Suguru and Sudoku?

Sudoku fills a 9×9 grid with 1-9 so each digit appears once per row, column and 3×3 box. Suguru fills cages of varying size with the digits 1 to N (the cage's cell count) and forbids two identical digits from touching, including diagonally — with no row or column rule. In Suguru a digit can repeat in a row as long as the copies don't touch, which Sudoku never allows.

Why does Suguru look like Sudoku?

Both are square grids of digits solved by pure logic with a single solution, and they share a Japanese puzzle heritage, so they're often printed together. But the resemblance is only surface-deep — their rules are fundamentally different, and Suguru has no row or column constraint.

Can numbers repeat in a Suguru row?

Yes. Unlike Sudoku, Suguru has no row or column rule, so the same number can appear several times in a row or column — provided no two copies are adjacent to each other, including diagonally. This is one of the clearest signs that Suguru is not a Sudoku variant.