Futoshiki vs Sudoku: Is It Really Similar?

Futoshiki gets called "greater than sudoku" for a reason — at a glance it really does look like sudoku's smaller, arrow-covered cousin. But are they actually similar, or just superficially alike? If you love sudoku and you're wondering whether Futoshiki will feel familiar, or you're deciding which to play, this comparison breaks down exactly how the two relate: what's the same, what's genuinely different, and which one suits the kind of solver you are.

The short answer: they share the same skeleton but think differently. Sudoku gives you numbers to place; Futoshiki gives you relationships to untangle.

What they share

Both Futoshiki and Sudoku are built on the Latin square — fill a grid so each digit appears exactly once in every row and every column, with no repeats. That core rule is identical, which is why any sudoku player can pick up Futoshiki in minutes. Both are also pure logic puzzles: no arithmetic, no guessing, exactly one solution reachable by deduction.

So the foundation is the same. If you can solve sudoku, you already understand half of Futoshiki.

The two big differences

Here's where they part ways:

• No 3×3 boxes in Futoshiki. Sudoku's defining sub-regions are gone. Futoshiki only enforces rows and columns — which actually removes one of sudoku's three constraints.
• Inequality arrows instead of box logic. In their place, Futoshiki adds greater-than and less-than signs between cells. These relationship clues do the work the boxes used to, but in a completely different way: they tell you order, not position. (More on the mechanics in what is Futoshiki.)

So the trade is: lose the boxes, gain the arrows. That single swap changes how you think more than you'd expect.

How the thinking differs

In sudoku, you're constantly scanning three overlapping regions — row, column, and box — to find where a digit is forced. Your eye learns to triangulate.

In Futoshiki, you reason about chains of relationships. A run of arrows forces digits to climb in order; the ends of a chain are squeezed toward the extremes of the range. Instead of "where can this 5 go," you're asking "what's the smallest this cell could be, given everything that must be larger than it?" It's order-based logic rather than position-based logic — covered fully in inequality chains.

Many sudoku players find this genuinely refreshing: same comfort with the grid, a brand-new kind of deduction.

Is Futoshiki harder than Sudoku?

It depends on size, and they're hard in different ways:

• A small Futoshiki (4×4 or 5×5) is easier than a standard 9×9 sudoku — fewer cells, and the arrows give you strong footholds.
• A large Futoshiki (7×7 to 9×9) compares to a hard sudoku, but the difficulty comes from tracking dense arrow networks and long chains rather than spotting box patterns.
• The learning curve is gentler at first (the rules are simpler, with no boxes), but the arrow logic is unfamiliar, so there's a short adjustment period.

Neither is universally harder. Futoshiki is usually more approachable at small sizes and comparably tough at large ones.

Which should you play?

• Play Sudoku if you want the classic 9×9 experience, you enjoy box-scanning logic, or you're after a long, familiar solve. Start at the Sudoku hub.
• Play Futoshiki if you've done plenty of sudoku and want a fresh kind of deduction, you like the idea of relationship clues, or you want a quicker puzzle that still feels logical. Jump into Futoshiki.
• Play both if you enjoy logic puzzles — and if you like the constraint-based twist, the same instinct powers KenKen (arithmetic cages) and killer sudoku (sum cages), two more sudoku relatives worth a look.

The bottom line

Futoshiki and Sudoku are genuinely related — same Latin square core, same no-guessing logic — but Futoshiki drops the boxes and adds inequality arrows, which shifts the thinking from position-based to order-based. The "greater than sudoku" nickname is fair: it's sudoku's skeleton with a fresh kind of clue. If you enjoy sudoku, an easy Futoshiki is a low-risk, satisfying next step.

Frequently asked questions

Is Futoshiki similar to Sudoku?

Yes, fundamentally. Both are built on the Latin square rule — each digit once per row and column — and both are pure logic puzzles with a single solution. The differences are that Futoshiki has no 3×3 boxes and adds greater-than/less-than arrows between cells, which makes the solving feel different even though the foundation is the same.

What is the difference between Futoshiki and Sudoku?

Sudoku is a 9×9 grid with 3×3 boxes and given digits, solved by scanning rows, columns, and boxes. Futoshiki is usually smaller, has no boxes, and replaces them with inequality arrows that tell you which neighbor is larger. You solve Futoshiki by reasoning about order and chains rather than box placement.

Is Futoshiki harder than Sudoku?

It depends on grid size. A 4×4 or 5×5 Futoshiki is generally easier than a standard 9×9 sudoku, while a 7×7 to 9×9 Futoshiki is comparably hard. They tax different skills — sudoku is box-scanning, Futoshiki is chain reasoning — so neither is universally harder.

Can I play Futoshiki if I'm good at Sudoku?

Absolutely, and it's the natural next step. The Latin square logic transfers directly, so you already understand the no-repeat rule. You only need to learn how to read the inequality arrows, which takes a few puzzles. Many sudoku fans pick up Futoshiki in one sitting.

Does Futoshiki use math like KenKen?

No. Despite the arrows, Futoshiki has no arithmetic — the signs only indicate which cell is larger. That's different from KenKen, which uses addition, subtraction, multiplication, and division in its cages. Futoshiki is pure ordering and placement logic.