Futoshiki Solver enforces Latin-square rules
For an N×N puzzle, every row and every column must contain the numbers 1 through N without repetition. There are no 3×3 Sudoku boxes on this page.
Free Online Futoshiki Solver
Solve Futoshiki inequality puzzles with Latin-square logic.
Enter known numbers and greater-than or less-than signs on a 4×4, 5×5, 6×6, or 7×7 board. The Futoshiki Solver combines row and column uniqueness with inequality constraints, all in your browser.
Futoshiki Solver — enter numbers and inequality signs
Fill any printed givens, then choose < or > between neighboring cells. Horizontal signs compare left to right, and vertical signs compare top to bottom.
Puzzle input
Futoshiki board
Type known numbers from 1 through the board size. Leave unknown cells blank.
Use the small sign controls between cells for inequality clues. Blank means no clue between those two cells.
Scope: this Futoshiki Solver focuses on inequality puzzles, Greater Than Sudoku, and Latin-square row/column constraints. It is not a standard 9×9 Sudoku Solver and does not use 3×3 box rules, OCR, or an online puzzle database.
Futoshiki Solver result
Enter a puzzle, then solve to see the complete answer, cell candidates, inequality conflicts, row and column duplicate conflicts, no-solution messages, multiple-solution warnings, and optional reasoning steps.
Complete Futoshiki Solver answer
Cell candidates
Greater-than and less-than conflicts
Row and column duplicate conflicts
Copyable Futoshiki Solver answer
Step-by-step Futoshiki Solver reasoning
- Enable step-by-step reasoning before clicking Solve to record the Futoshiki Solver search process.
Futoshiki Solver workflow from inequalities to answer
Futoshiki Solver, Greater Than Sudoku Solver, and Latin Square Puzzle Solver intent belongs on one page because the same row, column, and inequality constraints drive the answer.
Futoshiki Solver board input
Choose the board size, type the known numbers, and place < or > signs between adjacent cells. The Futoshiki Solver keeps all inequality puzzle clues in one compact board.
Futoshiki Solver constraint search
The solver removes row and column duplicates, checks every greater-than or less-than relation, and searches the smallest candidate set first for a fast local solve.
Futoshiki Solver result checks
After solving, the result area shows the complete answer, each cell's candidates, inequality conflicts, row and column duplicate conflicts, no-solution warnings, multiple-solution warnings, and optional reasoning steps.
How the Futoshiki Solver works
This Futoshiki Solver uses one browser-side engine for Futoshiki, Greater Than Sudoku, and Latin square inequality puzzles.
Futoshiki Solver checks inequalities
Each < or > sign becomes a direct constraint between two neighboring cells. A candidate is rejected as soon as it breaks one of those greater-than or less-than clues.
Futoshiki Solver reports uniqueness
The search stops after proving no answer, finding one unique answer, or detecting a second answer so the page can warn when the puzzle has multiple solutions.
Futoshiki Solver input guide
Use these Futoshiki Solver tips to enter inequality puzzle clues cleanly and avoid common Latin-square mistakes.
01
Enter only Futoshiki Solver givens
Known numbers must be between 1 and the selected board size. Leave blank cells empty rather than using 0, dots, or question marks.
- A 5×5 board uses 1 through 5
- Rows and columns cannot repeat a number
02
Place Futoshiki Solver inequalities carefully
A horizontal < means the left cell is smaller than the right cell. A vertical < means the upper cell is smaller than the lower cell.
- Use > for the opposite direction
- Leave the sign blank when no clue is printed
03
Keep Futoshiki Solver boundaries clear
This page is for Futoshiki, Greater Than Sudoku, inequality puzzles, and Latin-square constraints. Standard Sudoku with 3×3 boxes belongs in the existing Sudoku Solver.
If a puzzle fails, inspect inequality conflicts and row or column repeats before treating it like an ordinary Sudoku grid.
Futoshiki Solver FAQ
Common questions about using this Futoshiki Solver for Greater Than Sudoku and Latin square inequality puzzles.
Is this Futoshiki Solver also a Greater Than Sudoku Solver?
Yes. Many people search for Greater Than Sudoku Solver when they mean a Latin-square number grid with < and > signs between neighboring cells. This Futoshiki Solver handles that same inequality puzzle model on one page.
Is this Futoshiki Solver a Latin Square Puzzle Solver?
Yes, for Latin-square puzzles that use row and column uniqueness plus adjacent inequality clues. It is not a general Latin square research tool, but it solves the common Futoshiki-style puzzle format.
How do I enter signs into the Futoshiki Solver?
Use the sign controls between cells. For horizontal clues, < means the left cell is less than the right cell. For vertical clues, < means the upper cell is less than the lower cell.
What board sizes does the Futoshiki Solver support?
The interactive tool supports 4×4, 5×5, 6×6, and 7×7 boards. Those sizes cover common printed Futoshiki puzzles while keeping the browser-side search responsive.
Can the Futoshiki Solver show candidates for each cell?
Yes. The result area lists candidate numbers that fit the original known digits, row and column uniqueness, and immediate inequality constraints. The answer grid then shows the solved value.
Does the Futoshiki Solver detect conflicts?
Yes. It reports greater-than and less-than conflicts when two known numbers already contradict a sign, and it reports duplicate conflicts when a known number repeats in a row or column.
Does the Futoshiki Solver detect no solution or multiple solutions?
Yes. If the clues contradict each other, the Futoshiki Solver reports no solution. If more than one valid Latin-square grid fits the clues, it warns that the puzzle is not unique.
Is this the same as the regular Sudoku Solver?
No. A regular Sudoku Solver uses 9×9 rows, columns, and 3×3 boxes. This Futoshiki Solver ignores 3×3 boxes and focuses on inequality puzzle clues plus Latin-square row and column constraints.
Are my Futoshiki Solver inputs uploaded?
No. After the page loads, the Futoshiki Solver runs in browser JavaScript. Your numbers and inequality signs stay on your device.
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